Use on wood, paint, metal, plastic or drywall. Planting sand on four sides can effectively improve the service life and reduce the cost. Using high density sponges as base material, the resilience is excellent, plasticity is strong, and it is not easy to tear. The Sanding Sponges are portable and handy, and suitable for polishing flat and irregular surfaces. Washable and reusable, can be used wet or dry,and also can be used directly in water.Because of its own water storage function, it can reduce flushing and improve work efficiency. 6 Pack Sanding Sponge, Coarse/Medium 4 Different Specifications Sanding Blocks Assortment,Washable and Reusable