[Specification]Grit printed on the sanding sponge, easy to distinguish and use, no need to put all the sand blocks together to compare, at a glance. [Quality]Using high density sponges as base material,made from high-quality brown corundum with special treatment and special glue formula. 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. [Use]Suitable for polishing flat and irregular surfaces,wet, dry, wood, paint, metal, plastic or drywall.