Compatible with eyepieces of Leupold Ultralight, FX-I Rimfire, FX-II 2.5x28mm Scout, VX-2 1.5-4x28mm Scout, VX-Freedom 1.5-4x28mm Scout, VX-1 Rimfire, VX-2 Rimfire, FX-II Rimfire, and Prismatic riflescopes. The Alumina Flip-Back lens covers feature powerful neodymium magnets to hold them securely closed and triple O-ring seals to provide maximum protection.