Case Study: Custom Shell Button for a Promotional Product Agency in South Korea
Source:Smoke Bomb Fireworks /
Time:2026-09-18
Shell Button for a Promotional Product Agency in South Korea
A Promotional Product Agency approached us with a shell button requirement for the South Korea market. The brief was specific: a defined look, a hard launch date and a unit cost that had to survive freight and duty. This case study records what was specified, what went wrong in sampling and how the bulk order was delivered.
The challenge
- A zipper puller that broke under pull test at the warehouse
- A trim that passed sampling but failed in-line because it was never cycle tested
- Elastic that lost recovery after three washes
What we specified
| Item | Shell Button |
|---|---|
| Client type | A Promotional Product Agency |
| Market | South Korea |
| Order volume | 50,000 pieces across 2 specifications |
| Base material | Rubber |
| Standard size | 15 mm Width |
| Finish | Glossy Enamel Coating |
| Sampling rounds | 4 |
| Delivery window | 8 weeks from PO to ex-factory |
| Compliance | REACH SVHC Screening |
How it was resolved
- We rebuilt the specification around Rubber and locked the tolerance before bulk.
- The finish was moved to Matte Black Coating after strike-off tests showed better durability.
- A pre-production sample was approved and retained as the golden reference.
- Production ran with in-line inspection and a mid-run photo report.
- Cartons were packed to the client's own barcode and ratio specification.
Result
- 50,000 pieces delivered inside the 8-week window.
- Unit cost held within 2.0% of the original quotation.
- Inspection-related rejection stayed under 1.5%.
- The specification is now on file, so reorders reproduce the approved sample.
What we would repeat
Approve a pre-production sample made from the actual bulk base material. Substitute material behaves differently in finishing.
Planning something similar?
Send the reference sample or tech pack and we will come back with a costed specification, a sampling timetable and the compliance documents your market requires.
