The RAWLINGS Mach 2 Baseball Bat is a lightweight metal alloy bat designed for youth baseball players. USA Baseball stamp. With a 2 5/8" diameter barrel and a balanced swing weight, this bat is designed for beginner players looking to develop their skills on the field. The black Rawlings bat is part of the Avenge series, approved by USA Baseball, and features a 29" length and 18 oz weight. Whether you're hitting the field for a game or practicing your swing, the Rawlings Mach 2 Baseball Bat is a reliable choice for young athletes.