High-quality material: The sanding block is made of high-density sponge with a surface coated in high-quality brown corundum abrasive, providing effective polishing performance. This material is flexible, sharp, wear-resistant, resistant to cracking, and offers a long service life. Function: The abrasive sponge can be used to polish concave, convex, and uneven surfaces to achieve a smooth finish. It can be used wet or dry as needed. The sponge has water-absorbing and water-retaining properties, allowing extended use in wet conditions and can be washed and reused. Practical design: The hand sanding block features an 80-mesh encapsulated surface design, enabling multi-side use and providing a secure grip. The square shape is suitable for curved areas and component joints. Size and grit: Includes 4 gray abrasive sponges, each measuring 10 cm x 7 cm x 2.5 cm. Compact and lightweight for easy portability, ideal for sanding both large and small parts, including corners and edges. Wide use: Suitable for sanding and surface preparation on wood, metal, tiles, plastic, glass, steel, paint, stone, and other materials. Also effective for sanding crafts and polishing irregular surfaces.