abrasive sponge grinding block Size:100x70x25mm,140x115x5mm, 125x100x10mm abrasive sponge grinding blockSize:100x70x25mm,140x115x5mm, 125x100x10mmIt's used for special surfaces of metal,paint,wood plastic by handIt's high efficient for fine grit.Density of sponge:high, middle, lowApplication:Flexible and soft/ideal for dry and wet grinding/reusable after washing.