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The 21.7" balance ball provides a core strengthening workout during your daily routine. Ergonomic backrest provides comfortable sitting Helps to improve spinal alignment and relieve nerve compression. Removable balance ball can be used for exercises on top of the chair or outside of the chair. Includes a desktop workout guide for effective low-impact workouts and stretching routines. Includes adjustable support bar and air pump. Designed for 5-511 people up to 300 lbs. PVC base is stable and lightweight. Vinyl Balance Ball - Latex Free Lockable caster wheels Assembly is required with one simple tool. About Gaiam: Gaiam has been committed to creating positive changes to the environment since its introduction in 1988. Our focus on our planets health means that all Gaiam products are eco-friendly. Green-caring beliefs are increasing Gaiam stands behind that belief in every step. Assembled dimensions: 22W x 22D x 31H in. You can exercise while working. Provides core strength and rear support. Exercise ball and chair base included Weight Capacity: 300 lbs Your choice of color. -