Our fast pitch youth softball bats come in 2 different models. Per ASA rules, all softball bats are identical from the transition through the 2 1/4" barrel. The differences are in the handle thicknesses and knob styles. The Youth Model 59 has a medium 15/16" handle with a traditional knob. The Youth Model 73 has a medium 15/16" handle that flares to a large knob for comfort, balance and a lighter swing feel.