dear sir our factory specificalize in all kinds of material o rings, 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 please sent your email to our factory email box so as to our factory shall quote china best competitive price and sent sample to you; wait for your reply! Ms clare