The goal of the Hands Inside Trainer is to promote proper muscle memory by attacking the inside part * Constructed of durable 85 durometer urethane, the H.I.T. will not break or crack over time. The "st * 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 size