Main features Highly antidestructive power nimble dial-up Force 160-180 grams Contact resistance<100 Ω Service life≥ 500 thousand Main components Zinc alloy chrome-plasted button Solid framework Electroconductive rubber PCB Users choice Button chrome-plasted colors: polished or sandblasted chrome Colors of framework is chosen by customer is available Other usage keyboard is available besides using for telephone. Package Carton size:420*340*115mm G./N.W.:9.5/8.5KG 20Ft Qty: 1640 ctn(80pcs/ctn)