items: silicone o rings material: 100% food grade silicone certificates: FDA,LFGB,ROHS Practical ... ,debossed and color filled 3. Equipments: CNC,EDM,Griding machines,Compresssion machines,imported from Taiwan 4. Daily availability 50000pcs 5. Mainly field ... ,blister box,Pebag,OEM packaging available!ImagesCertificates: Practical silicone o rings