This mini exercise ball packs a powerful punch. Use it during your workouts to create instability, which - over time - will help build your stabilizer muscles. Easily adjust the firmness and pressure of your ball by inflating or deflating the air inside.

• XS = 12.7cm diameter
• S = 19cm diameter
• M = 25cm diameter
• 100% Non-toxic PVC
• Hypoallergenic and phthalate free
• Anti-burst
• Includes straw and plug