... )waterproof,dustproof,long life 2)similar keyboard can be used 3)flexible,soft,smooth,good touching ... 40 to 60 shore A,depending on customers' requirement. 2.long life and excellent abrasion resistance , high and low ... 3.soft, flexible and water-resistance of the silicone keyboard 4.all manufacturing processes confirm to the ISO9001-2000 ... .OEM orders are highly welcomed and accepted silicon keyboard