Its BDC 60 reticle is designed for long-range shots up to 60 yards and is calibrated specifically for crossbows shooting up to 350 fps. Durable 1" tube with hand-turn 1/4" adjustments at 20 yards and a 20-yard parallax setting. Fully multicoated lenses with 92% light transmission for exceptional low-light performance. Waterproof, fogproof and shockproof. Scope rings not included.