dear sir as a leader manufacturer in china,our factory specificalize in all kinds of material o rings,rubber parts,plastics parts,metal parts,stamping parts,metal 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 NBR,HNBR,VITON , SBR, NBR, EPDM, CR,Silicone, FI, Nylon, plastic and so on,please sent your email to our factory email box: so as to our factory shall quote and sent samples to you; Ms Ema/salez