Transform a standard school chair into a Wobble Chair enabling kids to have an outlet for excess energy while alleviating anxiety, stress, hyperactivity, and boredom. Rocking engages and strengthens core muscles resulting in better posture and improves blood flow to the brain. Each "foot" snaps onto standard round chair glides (measuring between 28 mm – 32 mm (1-1/8” – 1-1/4") in diameter) - no tools required! Use on tile, wood, and carpeted floors.