The Composite Xelerator Fastpitch Softball Pitching Training Aid and Warm Up Tool with 12 Inch Premium Leather Indoor Ball for Improved Grip Best For Beginner, Intermediate And Advanced Pitchers Wanting To Improve Pitching Speed And Accuracy 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