Sportime Yuck-E-Medicine Ball, 4-1/2 Inches, 1-1/10 Pounds, Red Red medicine ball for tactile and heavy input work Foam outer skin with filling of small polyvinyl chloride (PVC) balls in non-toxic gel for contouring to fit hands, feet, and curves of body Rolling of interior balls provides tractor-like movement for both massaging and stimulating the body Form fits to hands to provide comfortable handles for holding and lifting Measures 4.5 in diameter