Increase your batting speed, power, and 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 bone bruises if the batter is jammed with an inside pitch. For baseball and softball, with or without a batting glove, and with wood or aluminum bats. They are constructed using a durable, rubber-like resin. When worn correctly on the top hand holding the bat, creates the correct grip technique to increase your bat speed, power, and bat control. It also 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 use 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.