Membrane Switch Material:Autotype Polyester or Polycarbonate Dome:with metal or steel Rear adhesive:3M series, Soken,etc. ... red windows 2.Embossed red leds and metal domes 3.100% function test 4.Water proofSuzhou Menhow Electronic Co., Ltd ... thin thickness, good tactility,abrasion resistant,installation and connection convenience. 4. Tightness is good, moisture-proof, dust-proof, waterproof, anti ...