Wobble Stool by Uncaged Ergonomics, also known as a stand up desk stool. Round, fabric for cool cushioned comfort. Self stabilizing base returns upright after use. Non marking and non skid base. Adjustable height, 23" -33". Wobble Stool is a fun chair that makes it easy to move around while sitting. It naturally tilts and moves under your control helping you stay active and productive at home or the office. In MINT condition. Asking $150 OBO. Thanks for looking.