UTG Rubber Scope Eyeshade for 36, 40, 41.5, 43mm Eyepiece Made from rubber with Multi-Folds and an ergonomic Eye cup, providing ample flexibility as comfortable cushion and protection against recoil Designed to fit scopes with approximately 3'' Eye relief, adaptor kit includes a lockable hoop to secure on scope's Eyepiece Relieve Eye strain by blocking glare or enhancing low light, improve target focus by eliminating distractions from peripheral movement