I was a long time thinking on what type of disc I should take! I then decided for Kids Disc - the other units were just too expensive and so I wanted to try it with this one. A closer study of the movements of the different discs, I noticed that this entry level model provides the most flexibility when compared to the other models. These are slightly bulkier both in size and as regards the flexibility of exercise variations! More exercise variations, for less money!
The company Will perhaps by it writes Kids, adults simply sell more expensive products! FAZIT For my knee problems hit the spot! It's fun too! Relatively small device - handy for stowing!