Mercori Air Stability Wobble Cushion, Blue, 35cm/14in Diameter, Balance Disc, Exercise Disc, Balance Cushion, Athletic Inflatable Twist Massage Balance Board, Pump Included Effectively increase the blood circulation and help to relax. Good for active sitting, muscle strengthening and joint stabilization. Help shape your body to perfect style. Help improve balance, coordination and flexibility. Come with a deflated cushion and a free air pump. Instruction: Insert the needle of the pump into the hole to inflate. If deflate, insert only the needle into the hole without the pump body.