【 Package Content 】16 pcs grit sanding blocks; include 8pcs fine grade and 8pcs superfine grade.The sanding blocks are made of Brown alumina and blue sponge. | 【 Size 】Each sanding block is 4.7" x 3.9" x 0.47"/ 120 x 100 x 12mm,the sanding blocks include 4 different grade: coarse, medium, fine, and superfine grit. | 【Feature 】Sanding Sponge Blocks is great for sanding odd shapes, edges and into grooves.High-density durable sponge inside, solid and no easy to break, also resistant to water, wear, acid and alkali. | 【Washable and Reusable】The sanding sponges are designed for wet and dry dual-use, so it can reduce flushing and improve work efficiency. It also can be rinsed with water, easy to clean and reusable, please dry the water after each use. | 【Application】The double sided abrasive sponge is great for wood, paint, metal, kitchen, plastic or drywall. Flexible to sand edges, contours, grooves, flat surfaces, corners. It works better with detergent.