Balance Ball® StoolPut us in a chair and we often slouch or resort to other less than ideal positions. To help counteract those habits, we created our adjustable Balance Ball Stool. Fitting most standard desks, the instability of the dome shaped seat causes micro movements to aid core strength, posture and circulation. Instability induced micro motion firms core and improves circulation and posture Stool height ranges from 18 to 23 to fit most standard desks Stable, 360