This is a shockproof pad mainly used on wheel, simple bumper, the feet of crawling robot and friction wheel (in mEggbot it can be used to stabilize eggs and the components to drive eggs).
Features:
Made of black environmental silica gel;
Hardness: 70HA;
Diameter: 23.5mm;
Height: 12.0mm;
1 thorough-hole and 2 blind holes (not thorough-hole) with 16mm distance in the middle, compatible with Makeblock parts. Use screws and nuts to stabilize it.