Glass etched ballistic reticle for high performance crossbows. Ultra compact,light and edge to edge clear view and 5 brightness settings in red,5 brightness settings in green. Fast focus eye piece in ocular lens. Designed for crossbows shooting 300 fps and faster. Custom reticle with "Peak of Trajectory". Bore sight landing marks on top of tube for sight in. Aim points to 50 yards, water proof, fog proof, shock proof. Has lifetime warranty. Length-9.3",Weight-9.4 oz.,field of view -90 ft.@100 yards.