100%silicone material silicone key press environmental ,safe,comfortable , best quitity ,best price 20years experience 1,Application computer /calculator /cell phone / game machine2,Keypad button material 100% environmental silicone3,Logo as you want (good flexibility )4,Hardness 40-60 shore A as customized requirements5,Certification ISO9002 ,SGS,ROSH6,Harmless to body7,Smooth feeling8, welcome ...