Durable high-density material. Textured surface for targeted muscle groups. Portable design offers on-the-go use. Diameter: 5.55% acrylonitrile butadiene styrene, 43% thermoplastic elastomer, 1% iron, 1% rubber. The Nike Recovery Ball is imported. Featuring a compact design for on-the-go use, the Nike Recovery Ball is built with high-density material and a textured surface for a concentrated massage.