EASTON QUANTUM -5 (2 5/8" BARREL) USA YOUTH BASEBALL BAT The Easton® Quantum™ is a one-piece aluminum big barrel design constructed of lightweight and durable ALX100™ Performance Alloy. It features a concave end cap and a cushioned Flex™ grip, providing additional comfort in the hands. It is approved for play in leagues and associations that follow the USA Baseball standard.