The goal of the Hands Inside Trainer is to promote proper muscle memory by attacking the inside part of the ball Constructed of durable 85 durometer urethane, the H.I.T. will not break or crack over time Can be used with softballs OR baseballs - For right or left handed hitters "J" portion of the H.I.T. easily fits into "stem" and slides in and out adjusting to different sizes 100% Made in the USA