Before any mass production begins, you will need samples. Samples are how you confirm the look, feel, fit and electrical performance of a product before committing to thousands of units, and they are where most customization decisions are settled. Understanding the sampling stages and their timelines prevents surprises: a logo sample takes days, a structural prototype takes longer, and a tooling sample takes longer still.
This article describes the sampling workflow from first conversation to approved sample, the typical duration of each stage, how sample fees are handled, and what you should evaluate on each sample. A clear sampling process is one of the hallmarks of a professional OEM partner.
Q: What are the different types of samples I will receive?
A typical custom project involves several sample stages. First, an appearance or visual sample confirms the shape, color, logo placement and materials without necessarily having final electronics. Second, a functional or electrical sample confirms the charging performance, capacity, wireless alignment and protection behavior. Third, a tooling or pre-production sample is produced from the actual production mold near the end of development, confirming that mass production will match what you approved. Not every project needs all three; a private-label order may only require a branded sample, while a fully custom product needs the full sequence.
Q: How long does sampling take for a private-label order?
For a private-label project on an existing platform, sampling is fast. Once your logo artwork, color choice and packaging files are received, a branded sample can usually be prepared within days to around one to two weeks, because the product itself already exists and only surface customization is added. This short turnaround is one of the main advantages of starting with ODM or private label, and it lets you see the actual product in your branding quickly rather than waiting for a full development cycle.
Q: How long does sampling take for a custom-designed product?
For a product that requires new tooling, sampling is a longer process. After the design is agreed, a hand-built prototype or 3D-printed mockup is produced to confirm dimensions and ergonomics, followed by electrical validation, then the opening of the mold, and finally pre-production samples from the actual mold. This full cycle takes longer than a private-label sample and is driven mainly by tooling lead time and validation testing. Your account manager will lay out these milestones in a project plan so you know when each sample stage arrives.
Q: Do I have to pay for samples?
Generally, custom samples involve a sample fee, because producing them requires dedicated engineering time, prototyping materials, and often small-batch setup work. Off-the-shelf stock samples of an existing platform may be provided at little or no cost, but customized samples that apply your artwork, colors or structural changes carry a fee. The fee covers prototyping and setup, and it is normal and expected; a supplier that offers fully custom samples for free is often cutting corners elsewhere.
Q: Are sample fees refundable once I place a bulk order?
Many manufacturers credit or refund the sample fee against the first mass production order, because the sample work then becomes part of the development investment for the project. Whether the fee is refundable, partially refundable, or credited against the order should be confirmed in writing during the quoting stage. This arrangement is common and aligns both sides: the supplier is compensated for the prototyping work, and the brand's cost is offset once the production order is placed.
Q: What should I evaluate when I receive a sample?
Check several things rather than only the overall look. Confirm the size, weight, color and logo placement against your artwork; test the charging performance and, for wireless products, the alignment and magnetic hold; check the finish of the casing, the print quality and the accessories; and inspect the packaging and instructions. If anything is off, document it clearly with photos and measurements, because sample-stage feedback is far cheaper to fix than changes after mass production. A thorough sample review at this point prevents costly rework later.
Q: How many rounds of revision are normal during sampling?
It is normal to need one or two revision rounds. A first sample reveals issues that cannot be caught on drawings, such as color mismatch, logo positioning, fit of accessories or small electrical adjustments, and a revised sample is produced to confirm the fix. More than a few rounds usually indicates that the initial brief was unclear, which is why a detailed upfront specification saves time. Your account manager will track each revision and confirm sign-off in writing before any tooling is finalized.
Q: Who approves the final sample before mass production?
The final sample, often called a golden sample or approval sample, must be signed off by the buyer before mass production begins. Both sides retain a reference unit so that production can be matched against the approved sample. This sign-off is a formal milestone: once you approve the sample, the factory proceeds to production using that reference as the quality benchmark. If you later request changes after approval, they may affect price and timeline, so it is best to settle everything at the sample stage.
Q: What information do I need to provide to start sampling?
To start sampling efficiently, provide your logo artwork in a vector or high-resolution file, any color references or pantone values, the product model or platform you want to adapt, packaging designs or requirements, and your target certifications. For a fully custom product, also provide reference products, dimensions or performance targets. The more complete this information, the fewer sample rounds are needed; missing artwork or vague color descriptions are the most common causes of delay in otherwise fast private-label sampling.
Q: How does Zishine structure its sampling workflow?
Zishine runs a structured sampling process coordinated by a dedicated account manager. After your brief, our Shenzhen R&D center confirms feasibility and proposes the platform or design route; we then produce appearance and functional samples for your review, revise according to your feedback, and finally provide a pre-production or golden sample for sign-off. Sample lead times, fees and refund terms are agreed in writing before work begins, and each sample stage is tracked so you always know where the project stands. This disciplined workflow is what allows both our private-label clients and our custom development clients to move smoothly from idea to production.
