50 x 12mm Clear White Tracer Slingshot Ammo x 10 Packs 

Clear White Tracer slingshot ammo
See were your firing Easier to find
Half inch marble
Help you to improve your accuracy
Pack of 50 1/2 Inch Marbles
A highly visible alternative to metal slingshot ammo.
1/2"-dia. white glass ammo works great for target practice and is often easier to find and reuse than metal slingshot ammo.