The VX-Freedom 4-12mm delivers legendary Leupold performance and dependability in a versatile magnification range that's ideal for mid to longer-range shots. It's also equipped with the Leupold Custom Dial System (CDS), which gives you a customizable ballistics solution at your fingertips. This system is easy to install and even easier to use. Specifications and Features: Length 12.50" Proofs Fog/Waterproof Series CDS Weight 13.10 oz Reticle Tri-MOA Objective 40mm Eye Relief 4.90"-3.70" Field Of View 21.50-10 ft @ 100 yds Magnification 4-12x Tube Diameter 1"