Material: aluminum oxide or silicon carbide, dense sand.Matrix : the middle of the sponge or EVA, resin adhesive.Purpose: multi-function products, can be used for most products grindingFeatures : four or double-sided sand-planting, good softness.

Grits：36-40-50-60-80-100-120-150-180-220
Size：100x70x25mm & 125x100x12mm.