... ..Electronic profession seal or rubber components, like in handset pressed key, in DVD antirattler, electric cable wire connection seal and so onC..Various of ... .3. Various materials and hardness for your option, including Buna-N (NBR), HNBR, VITON, Silicone, FluoroSilicone, EPDM, Teflon, Natural Rubber, BUTYL, SBR, Neoprene ...