Constructed out of durable 6061-T6 aircraft grade aluminum; Allow for quick and easy operation; Flip-back functionality keeps a low profile in the open position; Powerful neodymium magnets keep the cap secure when closed; Triple O-ring seals for maximum protection from the elements; Compatible with post-2004 Leupold riflescopes with a 32-33mm objective lens; Matte Black Finish; Leupold's Full Lifetime Guarantee