Weight: 163 ± 5 g Circumference: 28.58 ± 0.32 cm Diameter: Approx. 9.1 cm Material: Surface / Natural rubber new solid layer Core / Cork Color: White × Red Made in Japan For spin check use Meets No. 2 certified ball standard specifications Recommended by the Japan Softball Association (Public Interest Incorporated Foundation) * Not compatible with wheel-type machines. Color transfer may occur.