1)100% silicone rubber materials,safety. 2)resistant to oil,fluid,flue 3)long service time. 4)waterproof 1)Various material available:SILICONE,NR,NBR ... ,EPDM,CR,IIR,VR(F) ,SBR ,VITON,etc 2)Safe and hygienic ,meet ROHS ... -state standards sizes available. 7)Package:1,Polybag and carton .2,Customized welcome. 8)OEM orders are welcomed. Natural ...