Our bandsets are named according to the ammo size they will most efficiently shoot.
Slingshot bands are most efficient when they generate the ideal amount of energy to propel the ammo used. Larger ammo requires more and/or stronger elastic material to be propelled efficiently, and vice versa for smaller ammo. Using a chronograph, we have tested every band set style imaginable and determined the most efficient one to shoot each standard size of spherical ammo (BB, 1/4", 5/16", 3/8", 7/16", and 1/2"). Therefore, rather than having to figure out which band set taper/width you want, all you need to know is which ammo size you want to shoot.