... square ring rubber manufacture 4.OEM square ring rubber Standard square ring rubberDetail of square ring rubber:Product: ... SILICONE,VITON,NR,CR,SBR,PUHardness30-100 shore ASizeCustomized/standard/nonstandardColorRed, Black, White, Clear, etcTemperatureCommon: -20~100degree centigrade;NBR(-40 ... stability good 6.) can be customized to the non-standard model7.) model is complete, the stock inventory 8.) ...