Ellsbury is not alone as these are seen on the thumbs of most guys we profile on WPW. What is it? From ProHitter.com: “PROHITTER produces quick hands, faster wrist turns, increasing bat speed and power. Hit for a higher batting average, with more pop and greater consistency! Most pro players are batting with PROHITTER for the advanced grip technique.” The ProHitter works by occupying the space between your thumb and your index finger, so that when you grip the bat, it does not get buried too deep in your hands, but instead stays in your fingers. This placement ensures that the hitter will be generating the maximum “flick” of the wrist. Any good hitter will tell you how important the wrists are as a hitter.