A simple, yet powerful foot massage that"s easy and fun - the kit contains a rolling pool, marbles, a shooter marble and a simple foot reflexology chart. Try chilling or warming marbles before use for an even more effective massage!Dr. C. Everett Koop extolled the benefits of soaking and massaging feet. Sounds crazy, but rolling feet over marbles really works - leaving feet tingly and revitalized after even 5 mintues of massage. You have to try it to believe it! Rolling pool inflates to 12.5" x 9.5" x 3.5".