National Federation of State High School Association.Cushioned cork center, A-grade grey wool winding, premium leather cover, Diamond Seam™,DriCore™ technology. NFHS approved and licensed. . 1 dozen baseballs Quality leather baseball with cushioned cork center A grade grey wool winding, DriCore technology, premium leather cover and diamond seam Approved by the NFHS (National Federation of State High School Associations) Diamond sports products are guaranteed against defects in workmanship and materials for 1-year