Our company is a reliable manufacturer of custom molded parts, specializing in molded rubber parts and rubber or tpe dust capplug for many years. The dust capplug is a dust protection for coupling. specification materials: nr, nbr, sbr, epdm, silicone, viton, tpe or per astm d2000 spec. Hardness: from 30 to 90 shore a.Colors: black, custom colors availablecertificate: iso9001:2008own 50 items now