... .Material: EPDM,SBR,NBR, NR. 2.Used for houseware as a parts 3.Size: 18(OD)x14(ID)x13(H)mm Custom ... .Material: EPDM,SBR,NBR, NR, and etc.2.Used as a parts to fitting the houseware, and machines3.Custom sizes and design ... your drawing or dimension4. Packing: 500pcs/polybag, 20 bags into a carton, carton size: 50x32x40cm5.OEM service, custom design welcome.