Built to last through thousands of hits, the 12 pack of SKLZ(R) Impact Balls help athletes refine their swing, experience instant feedback and locate that all-important sweet spot. These heavy-duty, whiffle-style practice baseballs are constructed with the same EVA rubber material found in car bumpers and collapse on contact without cracking like some other practice balls. The SKLZ(R) Impact Ball also features a standard 9" circumference (same as a baseball). FEATURES: Heavy-duty practice whiffle baseballs 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 baseball with 9" circumference Includes 12 practice balls per purchase Model: WFBSBL-001