1)100% silicone rubber materials,safety. 2)resistant to oil,fluid,flue 3)long service time. 4)waterproof 1)Various ... . 3)Excellent resistant to ozon,oxygen,mineral,oil,synthetic hydraulic fluid, fuels,solvents&chemicals. 4)Low permeability to gas ,air and high dielectric strengths ... carton .2,Customized welcome. 8)OEM orders are welcomed. Natural rubber