S-Raw Creative Never Dark Light In the Dark Light Up Basketball Material:surface-8.25mm rubber;middle bladder-99% raw robber;layers of fiber-one ply nylon yarn;inner bladder-85% butyl rubber;opening-air impermeability rubber Perimeter:29.53"-29.92";Weight:1.32-1.43lb The basketball can light in the dark for almost 5 hours High abrasion resistance index and long service life Occasion:Outdoor/Indoor