EASTON ADV -13 (2 5/8" BARREL) T-BALL BASEBALL BAT The Easton® ADV™ Tee Ball -13 bat is perfect for young players looking for a light swinging bat to generate more contact and power. The 2-5/8” barrel one-piece design is constructed of Hyperlite™ Composite, and has a rolled end and All-Sports grip, for better hold and comfort. This bat is approved for play in leagues and associations that follow the USA Baseball standard (ONLY for use with approved Tee Balls).