Hyperwear SandBell Total Body Blast Workout DVD with 3 SandBell Weights (18 lbs Capacity) The package comes with 2-filled 4lb SandBells, 1-filled 10lb SandBell, and 1-SandBell Total Body Blast DVD Sand provides active resistance working your stabilizing muscles and core. Works your grip, wrist and forearm strength Mulit-use. Can be used as a dumbell, kettlebell, medicine ball, slam ball, and slider. Throw and sale for full extension to train for explosive power Safe for any age. Great for physical education classes Easy to stack and store saving floor space. Safe on wood gym floors. Warranted not to it leak sand yet it can be slammed and thrown