Grit Options: Includes 7 different grit levels from 180 to 1000 for rough to fine sand.. Material: High-density sponge base with alumina coat. offers flexibility and long service life. Dimensions: Each block is 1.2 x 9.7 x 12 cm, compact size for handheld use. Dual-Use: Designed for wet and dry sand., washable and reusable after rins. and dry.. Applications: Suitable for sand. wood, metal, furniture, paint, drywall, and clay surfaces.