... ,E are made of UL approved nylon PA66,parts B and D are made of nitrile butadiene rubber(NBR)♦Thread spec ... part,large range in clamping cable,ultra-strong stretching resistance,waterproof,dustproof,and high ability to resist salt,acid,alkai,alcohol,grease ... and general solvent.♦Color:Black(RAL9005),light grey(RAL7035),silver(RAL7001) ...