1.Approved by UL(ROHS, TUV, CE, IP68... used on: waterproof case,distribution ... parts A,C,E are made of UL approved nylon PA66,parts B and D are made of nitrile butadiene rubber(NBR ... .Characteristics: Special design of clamping die and rubber part,large range in clamping cable, ultra-strong stretching resistance, waterproof, dustproof ... that can be designed at request. PG9 cable gland ( UL certificate )