The SKLZ Bolt Balls 12-Pack is designed for beginner baseball players looking to improve their batting skills. These soft micro balls are ideal for use with a pitching machine, with a maximum ball speed of 30 mph. Made of durable plastic, these synthetic balls offer a realistic feel and bounce for training purposes. Perfect for honing your hitting technique, this set is a must-have for any aspiring athlete looking to enhance their game on the field.