Calibrated for crossbows that shoot in the 330 FPS range, this lightweight, 8.5-inch aluminum-tube scope features 20, 30, 40, and 50-yard dots (fourth dot is free standing, just below the 40-yard crosshair) and fully-coated 3x optics. Available with non-illuminated black dots or one of two rheostat-controlled, illuminated colored dots (red or green).