Mizuno's MS380 softball was designed with over 100 years of superior ball-making experience to provide high-level performance and longevity to make it the perfect softball choice. Featuring premium synthetic leather and our Reactor Core, the MS380 softball is crafted to Mizuno's strict attention to detail and standards. DESIGN & DETAIL: Premium Synthetic Leather Cover: Incredibly durable synthetic leather cover that provides superior grip and feel Reactor Core: The ultimate in a polyurethane core for lasting performance and less break down that provides unmatched durability and consistency Core: .47 Size: 12" 12 Softballs included