The FIRM Small Stability Ball w/ DVD

55cm how many inches? 21.7 inches

Some of us use these instead of office chairs at work. They’re great. The 55cm is pretty small, so if you are a tall person I would recommend a larger size.

If you guys decide to offer the bigger version for the same price, I’ll buy it!

the size killed this one for me, but please get some bigger ones! i’d love a bosu too!

does it only come in pink???

Yes, the color correlates to the size. “55-Centimeter (Pink) is recommended for users measuring between 5 feet and 5 feet, 5 inches. 65-Centimeter (Green) is recommended for users measuring between 5 feet, 6 inches and 5 feet, 11 inches. 75-Centimeter (Purple) is recommended for users measuring between 6 feet and 6 feet, 3 inches.”