Product Features Each CenterMass sight is meticulously designed to mount at centerline of the bow to help eliminate offset weight. The Pro Pin has a narrower pin throat that ends in a round pinhead. This smaller throat allows for less target blackout, as well as a more defined aiming point. The high-performance Photochromatic shell adapts pin brightness to all light conditions for perfect pin clarity. The Dual Indicator System reduces time and movement by providing a needle for shorter yardages combined with a 2nd needle for longer range shooting. 3rd Axis Micro-adjustability, with 1st and 2nd non-micro adjustable axis.