In 1954 Trumark introduced the first slingshot ammo that is really fun to shoot....Tracer Brand Ammo! White marble REFLECTS LIGHT so that the eye can "TRACE" the ammo's path like a tracer bullet. SEEING THE AMMO CLEARLY as it heads toward the target, makes it easier to become an expert shooter. Also, the Tracer's LARGE 1/2" size is easier to grip, and the powerbands can be pulled smoothly with LESS HAND STRAIN. 50 Count.