WOBBLE IN YOUR OWN WAY:The non-slip, curved base allow for movement in all directions while seated. ADJUSTABLE HEIGHT: The height of wobble stool can be adjusted from 16.5'' to 24'', which can match the desk/table easily. EASY TO USE:No need to assemble. Just use it while taking it out from package. Lightweight design so that you can move and store conveniently. COMFORTABLE:Backless design encourages proper posture while strengthening core muscles. SAFETY: The rounded base is stable and it is made of silicone material which has anti-slip function and protects your safety. MEASUREMENT:12.99''Lx2.99''Wx16.53''-24.01''H; Weight Capacity:220lbs; Net Weight:9.5 lbs.