Insiderbat Size 6 Training Aid Correct your swing with the help of the Insider Bat Training Aid! This revolutionary muscle-memory training tool for baseball and softball players promotes proper grip, hand placement and the proper swing path before, during and after contact is made. In addition, the Insider Bat Training Aid emphasizes palm up/palm down hand positioning, gives instant feedback for batter and coach, trains the hitter not to roll wrists or sweep, emphasizes "staying inside the ball," and promotes proper hip rotation. The Insider Bat Training Aid can be used indoors or outdoors and is great for pre-game drills or as an on-deck reinforcement tool. The Insider Bat Training Aid is manufactured with aircraft 6061-grade aluminum and stainless steel. The shaft and sweetspot are powder-coat painted and finished with a high-gloss, clear coat. The handle is high-quality, injection-molded polypro copolymer with a comfortable polyolefin coating. Size 6 is suitable for ages 7-11. Size 7 is suitable for ages 12 and older.