The ProXR patented knobs are are now offered in 3 distinct knob designs AND the all new PUCK KNOB can be added to two of the ProXR choices 243m & DT71 for additional $20.         ProXR-ONE (#1-Original design), ProXR-ICON (#2-Icon) and the ProXR-EPIC (#3-Epic) See photos   Select your favorite barrel then choose the ProXR knob of your preference.  The ProXR-ONE knob is also now available in our BBCOR certified carbon fiber bat and many of our training tools! CFDT71-ProXR-O!  (US PATENT #7744497PROXR) SPECIFICATIONS:  Each bat chosen comes with a ProXR shaped knob, and the specs of the chosen models barrel. Bats have cupped ends when necessary to create optimum balance & weight differential.  Option Notes:Engraving: Name and number will be engraved as spelling appears. It is up to the discretion of DTB to refuse to engrave inappropriate language or phrases.  We can not engrave professional teams or players names or colleges  due to trademark rules without written consent. Engraved bats are non returnable.Cupping: No cup option is not available on this model.