Solid one-piece aircraft grade aluminum alloy construction makes these scopes highly durable Argon purging results in a waterproof and fog proof scope Fully multi-coated optics Dead-hold BDC reticle has a custom design that helps eliminate guesswork on hold-over and windage corrections 3-9x40 riflescope is ideal for big game, muzzleloader, and slug shotgun applications One inch tubes Fast focus eyepiece Low capped turrets Reset turrets: allow re-indexing of the turret housing to zero after sighting in the riflescope Waterproof: o-ring sealed Shockproof: lenses are locked in place Hard anodized finish 3-9X40 SPECS: Mfg: Vortex Optics