Knob cover Material:Plastic,Polyamide Color: Black, red,champagne and etc. insert: ... ISO9001 qualified Features: Black Plastics Door Long Sleeve Handles Knob/ Cover 1.Material:Plastic, bakelite, zinc-alloy steel, polyamide, stainless steel ... shiny surface, with complete neat body.5. Inspection: in house test are available, 100% inspection whole range when in production.6. Certificate ...