Product Specification Sheets and Tech Packs: How to Brief a Manufacturer Properly

A product specification sheet is a document that describes exactly what a product must be: its materials, dimensions, finishes, packaging and the tests it must pass. It is the main tool for how to brief a manufacturer, because a factory can only make what it understands. A clear sheet gives you accurate quotes, fewer sample rounds and a firm basis for quality checks. In clothing and soft goods the same idea is called a tech pack. This guide shows what to include, how it looks for different products and how to manage changes.

Why product specs for manufacturer briefs matter

When a buyer says "a leather bag, medium size, brown", ten factories will imagine ten different bags. Each will quote a different price for a different product. Good product specs for manufacturer teams remove that confusion. They help you in four ways:

Accurate quotes. Suppliers price the same thing, which makes it possible to compare their quotes.
Fewer sample rounds. The factory builds closer to your intention the first time.
Quality control. Inspectors need a written standard to judge against.
Dispute protection. If a batch is wrong, the spec shows what was agreed.

The spec also feeds your request for quotation. Attach it so suppliers can respond with confidence.

Specification sheet versus tech pack

The two terms overlap. A specification sheet is the general term used for most products, from hardware to packaged goods. A tech pack is the term mostly used in apparel, footwear and bags, and usually includes patterns, stitching details, bill of materials, size charts and grading rules. For electronics and machinery you may also hear "technical data sheet" or "technical file". The name matters less than the content: complete, measurable and unambiguous.

What goes in a product specification sheet

Use this structure and delete what does not apply:

Product identification. Name, internal code, version number, date and the author.
Purpose and use. Who will use it, where and how. This helps the factory choose suitable materials.
Materials. Type, grade, thickness and supplier or brand if required. Say "stainless steel 304" rather than "good steel".
Dimensions and tolerances. Length, width, height, weight and how much variation is acceptable, such as plus or minus 1 mm.
Colours and finishes. Colour references (a colour system code or a physical swatch), gloss level, texture, coatings.
Components and bill of materials (BOM). Every part, with quantity, material and source. More on this below.
Performance requirements. Load, capacity, battery life, waterproof level, temperature range, expected lifetime.
Standards and tests. The standards the product must meet and the tests required. Check with the authority in your destination market.
Branding and labelling. Logo placement, label text, language, warnings, barcodes and country-of-origin marking.
Packaging. Inner pack, retail box, master carton size and weight, units per carton, pallet pattern.
Quality criteria. What counts as a critical, major or minor defect, and the inspection plan.
Drawings and images. Technical drawings, photos, reference samples and 3D files.

Technical drawings for suppliers

A technical drawing for suppliers shows the product with measurements, usually from the front, side and top, plus a detailed view of important features. If you do not have a drawing, ask a designer or engineer to create one, or begin with a clear sketch with dimensions and photos of a similar product. Include units (mm or inches), a scale note and a key to symbols. A simple, clean drawing is better than a pretty one that leaves measurements out. For parts that must fit with others, mark the critical dimensions and tolerances.

Bill of materials: the list behind the product

A bill of materials is a list of every material and component in the product. For each line, record the item, description, quantity per unit, material or grade, supplier or approved alternative and any certificate needed. A BOM helps suppliers cost the product and helps you spot where a cheaper material might be swapped. It also shows which items could cause a delay if they are out of stock. Treat the BOM as part of the contract: no material changes without your approval.

Examples by product type

These are short examples of the kind of detail each product needs, not full specifications.

Garment (tech pack). Fabric composition and weight, colour reference, size chart with measurements for each size, stitching type, trims such as zips and buttons, label placement, wash-care text, packing method.
Plastic household product. Resin type and grade, wall thickness, colour code, surface finish, whether the plastic must be food-contact approved, mould details, weight, packaging.
Electronics. Circuit and component list, voltage and current, battery type and capacity, plug type for the destination market, required certification marks, firmware version, user manual language.
Food or agricultural product. Ingredient list, grade, moisture or size limits, packaging material, shelf life, labelling language, storage conditions, and the certificates your market needs. Check food rules with the authority in your market.
Furniture. Wood species and moisture content, joint type, finish and coating, hardware, load rating, flat-pack or assembled, carton marking.

Change control: keep versions under control

Specifications change. The risk is that the buyer and factory work from different versions. A simple change-control routine prevents this:

Give every document a version number and date, and put them in the file name.
Keep a change log: what changed, why, who approved it and when.
Send changes in writing and ask the supplier to confirm receipt and any effect on price or lead time.
Do not accept verbal changes on the factory floor. Ask for an updated document.
Link the approved sample to a spec version so you know which spec it proves.

Mistakes to avoid

Using subjective words such as "high quality", "strong" or "premium" without a measurable meaning.
Leaving out packaging and labelling, then arguing about cost later.
Forgetting tolerances, so every unit is slightly different.
Copying a competitor's specification without checking intellectual property rules. Respect other people's designs and patents, and take legal advice if unsure.
Sending the sheet in a format the factory cannot open. PDF plus an editable copy and image files work for most.
Not asking the factory to review the spec. Experienced factories often spot a cheaper way to reach the same result.

OEM, ODM and who writes the spec

How much you write depends on the manufacturing model. With OEM, the factory builds to your design, so your spec must be complete. With ODM, the factory offers an existing design that you adapt, so your spec can focus on changes, branding and packaging. Our guide to OEM vs ODM vs OBM explains the difference. For private label products, see how to find private label manufacturers.

Frequently asked questions

How long should a specification sheet be? As long as needed to remove doubt. Simple products may need one or two pages. Complex ones may need many, with drawings.

Do I need a spec if I buy a catalogue item? A short one still helps, listing the model number, the variant you want, packaging and labelling. It prevents mix-ups.

Can the factory write the spec for me? Many factories can document their own product. Check it carefully and make sure it matches your requirements before you sign.

What is a tech pack used for? It is a set of instructions for making apparel, footwear and similar goods, including measurements, materials and construction details.

Who owns the drawings? It depends on your agreement. Put ownership of designs and tooling in a written contract and ask a lawyer to review it.

How do I protect my design? Intellectual property rules differ by country. Speak to a qualified IP lawyer, and consider a non-disclosure agreement before sharing sensitive files.

Getting started

Start with one page: product name, materials, dimensions, packaging and the tests required. Add detail as you learn. When you are ready to send it to suppliers, post your request on Comilmart and attach the sheet, so verified manufacturers can quote on the same basis. Comilmart connects buyers with verified sellers across Africa, and there are no listing fees to get started.