We love using Sandbells at CATZ for a number of reasons:
They are safe - we would much rather drop a sandbell on our toes than a dumbbell.
They are versatile - you can use a sandbell in place of a dumbbell, a kettle bell, and a medicine ball (although a sandbell will not bounce) for most exercises.
They are effective - not only do you work the areas of the body you are targeting but sandbells also encourage grip strength.
They are durable - just try breaking one!
They are fun - you can play lots of games with sandbells as they are easy to toss and catch.
You can get more information about sandbells at Hyperwear: Hyperwear Sandbells