... of silicone rubber2) Screen printing logo with conductive carbon pills, laser etched graphics.3) Good conductity ,good force ,long life ,waterproof4) ... conducting, epoxy printing Silk printing ( could be replaced by laser etched graphics) MOQ 5000 pcs or negotiable SampleFree sample avaible PaymentT ... be used in electronic, industrial, medical, marine, aeronautical Custom laser engraved keypad