SL Side Arm Ball ThrowerSL Side Arm Ball Thrower About The Product: SL Advanced is a cutting edge tool designed to enhance batting and fielding practice by assisting with ball throwing. It features a specially engineered cup that securely holds the ball, mimicking the grip of the wrist and fingers. This innovative ball thrower, which is patent pending, includes an adjustable ball holder that enables throwing at higher speeds without altering the natural throwing motion. In