Baseball/Softball ProHitter Proper Grip Batter's Training Aid (Wood or Aluminum Bats, With or Without Batting Glove) ProHitter Baseball/Softball Batting Grip Training Aid. Worn on Thumb on Top Hand teaches Correct Batting Technique. Used with Wood or Aluminum Bats, with or without Batting Gloves. Used by New Little League Players to a Large Percentage of Today's Pros. Additional Quanities Available Upon Request