Features:Alleviate back pain and boost posture:It not only alleviates back pain but also improves posture. By promoting active sitting and stimulating muscle engagement it enables a healthier and overall improved posture.Inflation pump included for easy adjustments:The wobble cushion comes with an inflation pump included allowing you to adjust the air pressure to your comfort. This customizable feature offers the flexibility to suit different exercises therapy requirements or seating comfort levels.Specifications:Main material: PVCMain color: blackSize: 14.37"L x 12.99"W x 1.57"H inchesPackage includes:1 x Wobble cushion1 x Inflation pumpManual measurement please allow slight errors on size.The color may exist a slight difference due to different screen displays.