dear sir our factory specificalzie in all kinds of materisl o rings,o ring kits,plastic parts,metal parts,springs and so on; All kinds of specification and shapes, your requests are available Good quality, reasonable price,promote delivery Your sample, drawings or idea are welcome Fulfilling different kinds and quantities of orders to provide products from NR,SBR, NBR, EPDM, CR,Silicone, FI,Nylon,Plastic ,steel,alininum,braze,copper,stainless and so on; please sent your email to our factory email address: so as to our factory shall quote and sent samples to you; Eric chou