Increase your batting speed, power, bat control, and create the correct grip technique with the ProHitter Baseball and Softball Batting Grip Training Aid. The Prohitter is for both right handed and left handed batters and also prevents bone bruises if batter is jammed with inside pitch. For baseball and softball, with or without a batting glove, and with wood or aluminum bats. Constructed using a durable, rubber-like resin. When worn correctly on the thumb of the top hand holding the bat, creates the correct grip technique to increase your bat speed, power and bat control. It also prevents a batter from getting stung or bone bruises when a batter gets jammed with an inside pitch. A large percentage of baseball's best pro players are using Prohitter to help increase their hitting performance. For baseball and softball, with or without a batting glove, with wood or aluminum bats. Fits both right and left handed players.