Get an intense workout with the Gronk Fitness Premium Wall Balls. Use this 20 LB. Wall Ball for throwing, catching and more while exercising to improve strength and cardio. Works the core and helps build strength and endurance. Made of durable high-quality PVC leather and PP material; softer than a typical medicine ball. Tight, thick, double stitching ensures a securely closed and contained design. Loop on either side of stitching for gripping during use or easy storage.