CONSTRUCTION: Heavy-rubber construction for significantly longer life Durable and guaranteed to never break open or lose shape Consistent center of gravity Six weight options: 20 lbs., 30 lbs., 40 lbs., 50 lbs., 60 lbs. & 70 lbs. Color-coding and weight displays (lbs. and kgs.) Easy-grip rubber, no seams and no stitching Perfect for use in wall ball workouts, squats, partner/group tosses & slam ball and medicine ball exercises 13.6" diameter WARRANTY: Limited lifetime