... PET ,metal domes, PET, connectors,terminals,led ,green mask tail,3M468 back adhesive etc.Membrane switch advantages:1. Beautiful appearance, rich and bright ... erosion of harmful gases.5. Low cost, high lifespan membrane switches designed and manufactured for using the keyboard in a ... are lowest ,the life expectancy of different types of membrane switch is more than 100 million times.6.Easy to operate ...