NPB (Nippon Professional Baseball) official game ball, a high-quality hardball made of natural leather. Unlike the blue bags used by the teams, this is an authentic ball sold in shops with a serial number sticker. - Brand: Mizuno - Product Name: NPB Official Game Ball (for all 12 NPB teams) With Serial Number - Materials: Wool, Natural Leather (Cowhide), Rubber, Cork, Thread, Polyester Thank you for viewing.