Weighted Medicine Balls have a 14" Diameter, double-stitched, scuff-resistant vinyl shell. Maximum durability and keeps shape after multiple reps. Weight Selections: 8LB 10LB 20LB 25LB 30LB. Minimal Bounce on Drop. Stitch enables catchability and grip. A wall ball engages your entire body in a high-intensity workout that builds strength, endurance, and explosive power. Stack's is designed for a soft impact even when you do a full-body catch on your wall bounces. The larger mass is perfect for an easy grip when you're doing lunges, sit ups, tosses, you name it.