[Product Includes] 18 pieces of sanding sponges (60, 80, 100, 120, 180, 220 grit; 3 pieces each); includes coarse, medium, fine, and ultra-fine grit options. [Product Material] Brown corundum sand and high-quality sponge; wear-resistant and durable. [Reusable] Sanding block is soft and flexible, reusable, and does not shed sand; can be used both wet and dry, offers good elasticity, and resists dust buildup. [Wide Range of Uses] Double-sided sanding sponge ideal for DIY projects, plastic polishing, metal rust removal, woodworking, furniture finishing, and polishing amber or jade. Color: Blue Material: Sponge and sandpaper Size: Approximately 4.72 x 3.94 x 0.5 inches / 120 x 100 x 12 mm (each) Package Contents: 18 x Sanding Sponge Note: Light reflection and display differences may cause slight variation between the product color in images and actual color. Measurement may vary by +/- 1-3 cm.