The Amtech delta sanding sheets are perforated for dust extraction. P60 grit for coarse sanding P80 grit for medium coarse sanding P120 grit for medium sanding P240 grit for extra fine sanding Size: 140 x 140 x 100mm with hook and loop attachment. Ideal for sanding most types of wood and painted surfaces. Compatible with Amtech V6040 180W 2-in-1 detail sander and other brands.