... ROHS, 3-customized design welcomed 4-material:PC,PET,3M membrane switchSpecification:1.Best quality2.Best price3.Best service advantages: ... convenience. 4. Tightness is good, moisture-proof, dust-proof, waterproof, anti-oil, anti-corrosion and erosion of harmful gases proof ... and alkali proof, quakeproof. 5. Low cost, high lifespan, membrane switchs design and manufacture are using the keyboard as a ...