CVLIFE Tactical 3-15x42 IR Red & Green Illuminated Crosshair Optics Hunting Rifle Scope with 20mm Free Mounts Magnification: 3-15x;Objective Diameter: 1.26" (42mm);Exit pupil: 0.08"-0.4" (2.8mm-13.8mm); Eye relief : 105-80mm; Length: 9.75(32.5cm);Tube diameter: 30mm With the fully coated optical glass, the scope would give you a bright and high-contrast image. Made of high-strength aluminum alloy and with its one-piece tube construction, the scope is definitely for greater strength and durability. Illuminated Level: 5 Intensity (Red) and 5 Intensity (Green). With the free 20mm rail mounts, you can make the scope installed easily and work perfectly.