The Mini Xelerator 10u Fastpitch Softball Pitching Training Aid and Warm Up Tool with 11 Inch Premium Leather Indoor Ball for Improved Grip The Only Xelerator Model Specifically Designed With An 11 Ball For For Beginner And Intermediate 10u Pitchers Reduces Training Time To Minutes | No Catcher Required And You Can Train All Year, Indoors Or Out! Helps Correct Bad Pitching Habits Resulting In Improved Technique And Fewer Injuries Gently Pulls The Arm Into The Perfect Pitching Plane Which Helps Increase Pitching Velocity The Perfect Tool For Quick & Easy Warm-Ups Before Entering The Game