Backless Classic Balance Ball® ChairThe Backless Balance Ball Chair will engage your core, relieve pain, and help you breathe better without the temptation of resting your back and losing your posture. Small micro movements caused from balancing on the ball will stimulate blood flow, keeping your core and back constantly engaged. Chair includes a removable 52cm balance ball, air pump, base with two secure ball holders, and lockable caster wheels for easy movability. Engage your core,