The eyepal is a modern adaptation of the century-old peep sight. The eyepal enables you to simultaneously see the target and your front and rear sights all in focus. Since it's made out of a static Cling material it can easily be placed on reading, prescription, and safety glasses without marring the surface or leaving any residue. Compact, lightweight, and virtually indestructible, the eyepal is the ultimate addition to any Shooter's kit.