No.SA30 TRUMARK 5/16" STEEL-BALL AMMO has been selected for its special size; its not too small and its not too large. Ammo that is 1/4 or smaller is too light and will tear up wrist braced slingshot bands that need more weight in the pouch when shot. Steel ammo that is larger than 3/8 is too heavy and is unsafe if used improperly. Trumarks ammo is a good balance between light and heavy, and is the ideal size for shooting in all wrist-braced slingshots. Perfectly round, it feels good in the pouch, and lets you concentrate on your aim as you get ready to shoot. (Grade B ammo has a "flat spot" which is found on cheaper metal balls that are designed to shake-mix-twirl paint in spray cans). If accuracy is your goal, avoid "paint can balls" and always shoot Grade A Trumark ammo for pin-point accuracy! 225 Yd. Range using Trumark slingshots..120 cnt. bag...SEE >1/2" Marbles|3/8" Steel