Our line of fixed power riflescopes features Xtended Twilight lens system, wavelength specific lens coating optimize light transmission in low light conditions by placing extra emphasis on the blue/violet spectrum. Edge Blackened lenses and DiamondCoat 2 anti-scratch coating with a single bias spring erector. One inch and 30mm maintube diameter, manufactured from 6061-T6 aircraft quality aluminum alloy. Also features absolute waterproof integrity, Leupold pioneered the Argon/krypton gas waterproofing technology that keeps your FX riflescope fog free in even the most extreme circumstances. Neoprene scope cover included.