Rage Fitness Slam Ball,10, 15, 20lb Medicine Balls, Tread Texture For Firm Grip, Full Body Workout Dynamic Weighted Balls for Exercise, Smash Balls for Strength, Conditioning, Cardio and Core Workouts 20 LB is up for auction in Sports & Outdoors. The current bid is $13.50, 48% below the $25.76 MSRP, in Good Condition. This auction has ended — similar items appear in live auctions regularly.