Leupold VX-3i 1.5-5x20mm Matte Duplex Exterior lens surfaces are treated with diamondcoat 2, an ion-assist lens coating Provides higher light transmission and the greatest level of abrasion resistance Proprietary Argon/krypton gas blend, whichnearly eliminates the effects of thermal shock, and reduces the diffusion of gases sealed inside your scope Twin bias spring exerts up to 30 percent more holding force on the erector Versatile 3: 1 zoom ratio erector System that is ideal for virtually any situation