Use on wood, paint, metal, plastic or drywall. | Planting sand on four sides can effectively improve the service life and reduce the cost. | The Sanding Sponges are portable and handy, and suitable for polishing flat and irregular surfaces. | Using high density sponges as base material, the resilience is excellent, plasticity is strong, and it is not easy to tear. | 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.