Two 11A?" (29.2cm) dia. big wheels great for increasing power in the Chest, Shoulders, and arms and develop core strength, Upper and Lower body strength training exercises, Including : Push-Ups, Leg Curls, and Crab walks by positioning the hands or... - Update: 2008-03-13

14"(35.5cm) diameter Balance Cushion with message cone.It allows Seat and Foot Balance Training.It is inflatable as desired.Great for Training Balance/Strengthening AB muscles, etc. - Update: 2008-12-19