Of all the colors, white marbles reflect light rays back to your eyes the best. The bright white color helps the eyes to "trace" the ammo"s path all the way to the target * Since Tracer Brand marble ammunition is easy to see and spot on the ground, it can also be retrieved and shot over and over many times * The Tracer"s large 1/2" size are also easy to grip so that the bands can be pulled back smoothly to the shooting position with less hand strain while aiming * This item is not for sale in some specific zip codes