M Sports RBI Pro Swing Batting Aids...Get More Hits! Innovative batting aid assists with hand speed when swinging the bat. Get more hits by using the correct swing technique and hand position. M Sports RBI Pro Swing Batting Aids Features: Designed to help all ages and all genders Fits all baseball and softball bats A great tool to use at batting practices Learn the proper hitting technique and hand positions Develops quick hands, power transfer, bat positioning, swing path and muscle memory Immediate feedback helps batters to learn quickly Rusty Greer"s three hitting drills included Discover bat lag to contact more power and more control Helps to improve batter"s confidence Available in three sizes Colors: Blue (16 oz) Ages 16+ a Clear (12 oz) Ages 13-15 a Red (9 oz) Ages 7-12 M Sports RBI Pro Swing Batting Aids...A Must Have For Batting Practices!