UTG 4-16X40 1" Hunter Scope, AO, 36-color Mil-dot, w/ Rings Four-to-16X magnification One-inch tube diameter; 40-millimeter objective diameter 23-to-5.8' field of view at 100 yards; 3.9-to-3.5-inch eye relief Ten-to-2.5-millimeter exit pupil; 0.25-inch click value at 100 yards ; 365-millimeter length 20.1-ounce weight; Five yards to infinity parallax setting