1. The sandpaper block in 320-400 grit uses emery and sponge as base material and its total size is 100mm x 120mm (W*L). The thickness of the sanding pad is 12mm.2. The dual-use sponge sanding block is wet and dry dual-use, washable, and reusable, which can meet your various polishing needs.3. The sandpaper sponge is a good choice for sanding putty, scrubbing pots and pans, polishing furniture, woodworking, metal de-rusting, and more.4. After washing and cleaning the sanding sponge pad, please remember to squeeze out the water.