Wobble Wedge, hard black rubber type material for carpet and patio use.2.5cm x 1-1.3cm x 0.6cm The Wobble Wedge is a great tool to even out your furniture, equipment, toilet or anything that wobbles.Works on tile & any uneven floor.Stackable for really big wobbles.Colour black 30 pieces Wobble Wedges fix anything that wobbles, level anything that tilts, and tighten what's loose.Precise interlocking ridges moulded into the wedges allows them to be stacked to fill large gaps.They will not shrink or swell like wood shims.