FEATURES: Heavy-duty practice whiffle softballs Designed to refine an athlete’s swing and find that all-important sweet spot Extremely durable and built to last thousands of hits Constructed with the same EVA rubber material found in car bumpers EVA Pop-Back technology collapses on contact without cracking like some traditional practice balls Gives hitters instant feedback upon impact Limited-flight design allows for easy retrieval Heavier than traditional practice balls for more feel Standard size softball with an 11″ circumference