The Hitting Fast Arm, unique to Howell To Sports, will ABSOLUTELY increase your bat speed. HOW? The fast arm is an overload training device AND a mechanics teacher. The proprietary design of the Fast Arm allows the hitter to use correct mechanics when hitting inside and outside pitches. The weight of the Fast Arm "overloads" and strengthens the muscles while swinging - THE BEST way to increase bat speed. All biomechanical engineers will tell you that being "sport specific" in your training is the BEST way to increase muscle strength and velocity. Try this product if you're looking to increase Bat Speed and get stronger and quicker. IN STOCK