OFFICIAL SIZE & WEIGHT : These balls are constructed at official 9.0" size & 4oz weight to give your games a more authentic feel GREAT FOR TEEBALL : These Soft Strike Tee balls are perfect for any young teeball player to practice their catching and throwing skills HOLLOW CORE TECHNOLOGY : Provides the lightest ball possible for an official teeball in order to maximize performance and safety on the diamond DURABLE CONSTRUCTION : Syntex synthetic cover and double-stitched seams PLAY SAFE : Hollow rubber core makes throwing and catching safe for young players