Trumark’s 3/8″ steel-ball slingshot ammo has been carefully selected for it’s special size; it’s not too small and it’s not too large. Ammo that is 1/4″ in size is too light and tends to “tear up” wrist-braced slingshot bands that need more weight in the pouch when shot. Steel ammo that is larger than 5/16″ or 3/8″ is too heavy, and is unsafe if used improperly. 3/8″ ammo is a good balance between light and heavy, and it is the ideal size steel-ammo to use in wrist-braced slingshots. 70 count