This 8.25-inch aluminum scope features a variable speed and arrow drop-compensation setting for crossbows that shoot between 275 and 425 FPS and requires no adjustment for distance. Three duplex crosshairs and five dots calibrated for 20 30 40 50 and 60 yards (fourth and fifth dots are free standing just below the 40-yard crosshair) are available with a non-illuminated black dot or one of two rheostatcontrolled illuminated colored dots (red or green). An etched glass reticle and fully multi-coated 1.5 to 5x optics reduce the loss of light transmission while a 30mm tube heightens light-gathering and durability.