Ironcompany WSLM-200 Super Heavy Slam Ball – The way to build muscle and increase strength while using slam balls is to use Super Heavy Weight Slam Balls. These are not your typical slammer balls, or medicine balls as some call them. While only 15 inches in diameter, they are massively heavy at 200 lbs and perfect for Atlas stone lifts and carries, slam ball throw downs, strongman training, and strength training. Heavy slam balls create a significant amount of inertia and impact making the wall thickness an extremely important factor in their performance and longevity. The thicker the outer shell wall the better! Because of their dense, sand-like filler material, heavy slammer balls are non-bouncing and stay put where you slam them without rolling away. They are manufactured to perform heavy slam ball exercises which some trainers and athletes will sometimes use as an alternative to dumbbells, barbells and kettlebells. The firm texture of the non-bounce ball allows for easy gripping during all movements. This is the perfect “heavyweight” tool for crossfit workouts, personal trainers, core strengthening, or sport specific training like MMA, boxing, wrestling, and more!