The Gymnic Pink Gymnic and Physio-Gymnic Exercise and Play Ball is used worldwide for gymnastics, exercise, push-ball/cage-ball play and balance therapy. Ball is constructed of the thickest formulation of fine vinyl, using the seam-free roto-molding process. No seams means there is almost no chance for the ball to leak (unless it's punctured). Brightly colored and has raised latitudinal ribs that make it easier to hold onto during balance training, stretching or strengthening. Physico-Gymnic Balls are built tough; they've been rated to safely support 300 lbs. Measures 12 inches. Latex free.