1,Name:Silicone O-Ring 1,Good qulity&best price 2.Sizes:as the buyer ... .Electronic profession seal or rubber components, like in handset pressed key, in DVD antirattler, electric cable wire connection seal and so ... hardness for your option, including Buna-N (NBR), HNBR, VITON, Silicone, FluoroSilicone, EPDM, Teflon, Natural Rubber, BUTYL, SBR, Neoprene, HYPALON, etc ...