We have 30years' experience in manufacturing rubber products(O-ring,O ring kits,rubber cord and other rubber sundries).We have built a record of success by fulfilling the needs of industry for O-ring,O-ring kits,rubber cord,gaskets,washers and rubber bonding metal etc.The material rang from NBR,EPDM,SILICONE,VITON,HNBR,BR,CR etc. We Haisheng is to provide the domestic and overseas private industries and government with the highest possible quality custom sealing devices, QCP,PPAP and ISO9001-2000,TS16949,RoHS,FDA etc.We have own professional rubber mixing equipment and strong mould development,the company specializes in manufacturing high-precison O-ring,which are widely used in medical equipment,lighters,food machinery,watches,electronic accessories,auto parts and other industries.From 2014,we have been the gold supplier of O-ring for iwatch.