Material: Made of alumina emery and high-density sponge. Dual-Use: Can be used wet or dry for . sand.. Size: Compact dimensions of 9.9 x 6.8 x 2.5 cm (3.9 x 2.7 x 1 inches). Grit Options: Multiple grits from 36 to 220 for coarse to fine sand.. Wide Range of Applications: Perfect for sanding and smoothing a variety of complex surfaces, including stone, wood, plastic, metal, and even kitchen utensils. Achieve a smoother, more perfect finish on your projects, making these blocks an ideal tool for DIY enthusiasts and professionals alike.