Sand Paper Pistol Grips Peel and Stick Grip Enhancements for the Glock Gen 3/Gen 4 Models: 20, 21, 41 Sand Paper Pistol Grips manufactures custom granulate style handgun grip enhancements for the Glock Gen 3/Gen 4 Models: 20, 21, 41 Our tactical grip enhancements are not actually "sandpaper". They are 80 grit silicon carbide bonded to a thin but very durable, self adhesive peel-and-stick plastic backing. They will greatly improve the feel of your handgun and give you an almost "magnetic" grip. All products are built on demand and shipped no later than the following morning. (Most of the time we ship the same day.) FREE Shipping with Tracking via the US Postal Service. This is a self-adhesive peel and stick friction improving product that attaches directly to your existing grip frame or removable grip.