Blackpowder Products Scope Eye-Scope Recoil Pad Avoid Eye Injury! Most eye ends are made of metal or a hard rubber. Our Scope Eye, designed to reduce the risk of injuries from such scopes, is made from a soft, polymer material and slips directly over the scope eyepiece. The Scope Eye fits most scope eyepieces from 1.4" to 1.6 diameter. It can mean the difference between a safe, successful hunt and an unexpected trip to the doctor's office.