1) material: Black plastic, silicon rubber compound.
2) size (mm): Various diameter 1.5,1.8,10.0,12.0 etc. Various thickness 0.2,0.3,0.8,1.0 etc.
3) usage: Rubber keypad's contact for remote control, game machine etc.
4) rough or smooth surface, special made for gold plating as well.
5) custom make is available.
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