Our fast pitch softball bats come in 10 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 thinnest handle, 7/8", is found on the Model 59. Model 41 has a medium 15/16" handle. Model 61 has a thicker 1" handle. Model 71 has a medium flared handle and Model 73 has a medium flared handle with a large knob for better balance (lighter swing feel). ASA Models have the ASA logo engraved on the barrel and the handles on the ASA 41, 59 and 61 are straight to the traditional knobs.