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; Standard Eyepiece is the one used for all Leupolds (except the Leupold Ultralight riflescope models); Matte Black Finish; Leupold's Full Lifetime Guarantee