In 1954 Trumark® introduced slingshot ammo that made shooting slingshots really fun: Tracer® Marbles! 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, like a glowing tracer bullet! Before long, you will be hitting the Bull's-Eye over and over again. Seeing the marble ammo clearly as it heads toward the target, makes it easier for you to become an expert shooter. 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. This helps reduce the marble's cost per shot by recycling.