Separate material, construction, finish and packaging before comparing quotes. Then use the same model, colour split and test requirements with every supplier.
The listed flip wallet combines a PU surface with a TPU holder. Its cost includes a cover, card pocket and closure construction. Ask about bonding, stitch finish and card-pocket size. Comparing it with a simple back cover requires adjusting the specification.
02
Silicone: specify every layer
The JM-MF-1 listing describes silicone and an inner microfiber lining. Ask for the layer structure, lining coverage and magnetic option. Two cases with a similar soft feel can use different constructions; touch and a supplier title do not prove the full material stack.
03
Finish and mechanisms change the quote
Compare the same base case with and without a ring stand, print, coating or surface wrap. For a hinge, approve the opening range and resistance. For a wrap, review edge lifting. For a print, define artwork registration and abrasion checks.
04
Use an agreed test plan, not a slogan
Define sample count, device or fixture, load, cycles and pass/fail criteria with the supplier. Fit, magnet alignment, yellowing and drop claims need their own evidence. Keep the approved sample for the shipment inspection and future reorders.
One price tier does not confirm a mixed-model or mixed-colour minimum. Keep the approved quantities on each order line.
Supplier references in CNY, converted using the recorded 11 Sep 2026 reference rate. Listing tiers recorded 13 Sep; promotional discounts excluded. Reconfirm model, colours, stock and packaging. Freight, taxes, customization and DDNZ services are extra. Planning references, subject to a confirmed quotation. Exchange-rate source ↗
DDNZ / Approve on the sample
Look beyond the unit price. Meet the operation behind it.
Suppliers can differ in experience, funding, design, materials, capacity and service. Choose the strengths your order needs, then verify them with records, a site visit and product checks.
Phone-case production example
Materials & quality
What changes the buying decision
Layer structure, lining, coating and consistent incoming materials determine what can be repeated in the next batch.
What we can help verify
Approve the material specification and reference sample; agree fit, finish, wear and functional checks with acceptance criteria.
Four checkpoints. One reference for your next order.
Start with an approved sample, follow the agreed process, inspect the shipment and keep the reference for reorders. Explore each stage to see what to check.
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Approve the sample
Confirm the exact device, material layers, colour and finish. Sign off the physical reference before the production specification is frozen.