NO HANDLES FOR SUPERIOR CORE STABILITY First, try a movement - you pick - with a sandbag with handles. Then, try it without. It&';ll be no secret which is more challenging. Use our tough as nails Sand Med Balls to diversify your training and embrace the suck. Built out of 1000D CORDURA and made to be filled with sand so that they are more portable for training on the go and home gym friendly. They can withstand constant abuse in any environment due to the multi-layer closure system and superior construction. Our Sand Medicine Balls are patent pending and backed by our Scars Lifetime Guarantee.