These sanding files are made from cloth, making them highly flexible, and durable. Lasts several times longer than sanding paper. These also work great for wet sanding. The cloth is ultra thin, and can be cut with a blade. Emery cloth can be unclogged using a melamine sponge on the surface of the cloth. This emery cloth set includes 1 of each cloth #240 grit, #400 grit, #600 grit and #800 grit. Approximate size of each piece is 93.5mm (3.68") x 228mm (9").