1.Key frame uses special zinc alloy material. 2. Buttons are made of high quality zinc alloy, with a strong anti-destruction capability. 3. With natural conductive silicone rubber -weather resistance, corrosion resistance, anti-aging. 4. Double side PCB with golden finger, resistance to oxidation. 5. LED color is customized. 1.Button color: bright chrome or matte chrome plating. 2.Key frame color according to customer requirements. 3. With alternative interface.