Champion Sports 11" Official Softballs synthetic SIZE 11: Play ball with our medium compression Rhino Core softball; features a .47 COR cork core OPTIC YELLOW BALLS: Enjoy better visibility so you never lose track of the ball on the diamond SYNTEX LEATHER COVER: The smooth cover lets the ball roll off your fingertips and is extra durable RAISED SEAMS: Grip the seam and throw with more control; red stitching offers a classic look 12 PACK: Stock up for girls fast pitch, youth softball and slowpitch softball games and practices