items: silicone titanium pain relief sports necklace material: 100% food grade ... 1pcs/opp bag-ODM packingDelivery1.By air /sea 2.Express(DHL,TNT,UPS,AAE,EMS service,Door ... Height Gauge, caliper, Coordinate measuring machine, projection machine,2. roughness tester, hardness tester and so on. QC ... 1) Technicians self-check in production 2) Engineer spot check in production 4) International sales ...