Cheek-EEZ is an oval-shaped sheet of microcellular urethane that self-adheres to your gun comb to help eliminate recoil to the cheek. It installs in seconds, and decreases recoil energy to your cheek. Microcellular urethane typically is what engineers use to protect electronics from shock. It is comprised of billions of tiny (microcellular) gas bubbles that cushion vibration. What we've created is the highest quality in compression resistance for vibration isolation, and it won't break down over time. Check-EEZ maintains it's softness and flexibility even in the harshest of conditions. It's dramatically different than just a piece of foam pad you might see elsewhere with dimestore adhesive. Some car bumpers are even lined with Microcellular urethane if that gives you any indication of it's shock absorption capabilities. You spent hundreds or thousands of dollars on your gun. Your cheeks deserve Cheek-EEZ. These pads are also very useful if you need some fit or eye adjustment to your line of sight. You'll find the adhesive on these Made in America pads to be of a higher quality that the cheaper imported stuff, so you should plan on this being a semi-permanent addition to your gun. They're made to fix imperfections in your sighting and protect your cheek from full impact recoil eliminating some cheek slap. The installation is easy. There's a variety of thicknesses available, so you can pick your preference. You can also double them up if you need to for the perfect fit you are looking for. All four models of Cheek-EEZ are 5” x 6” size, so the main difference is the thickness. Available thickness : ►1/16” ►3/16” ►1/8" ►1/4" KICK-EEZ is proudly made in America.