Flared knobs are the most common style of knob and means the bat will have a tapered surface from the base of the knob to the thinnest part of the handle.
Traditional style knobs are common with metal bats and the knob has a straight transition from the knob to the thinnest part of the handle.
Bell knobs expand the diameter of the knob itself, adding mass at the base of the bat allowing it to work as a counter-weight.
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