Main Features: - 33cm diameter, portable and durable - Promote core stability, strengthens muscle tone, improves balance and body posture - Help to reshape your body and improve balance and flexibility - Used as a wiggle seat to provide sensory input, and to help calm children that have a hard time sitting still. - Ergonomic seating, relieve back pain and shoulder aches - Provide an unstable surface to exercise on, requiring you to use more muscles to stay balanced. - Sitting on the cushion forces you to stand with good posture - Easy to use, adjusted by adding or releasing air Vital Parameters: - Material: PVC, environmentally friendly - Diameter: 33cm/12.99 inches - Bearing weight: 300kg - Speciality: green and tasteless, super crush-resistant, anti-explosion - Color: blue, pink, and purple Inflation Notes: - Step one: press the balance pad side so that the air hole is far away from the ball back, and push air needle forward. - Step two: push out the air needle slightly, rotate the main body of the pump. Repeat step one till the needle is completely set in the hole. - Step three: keep the air cylinder slightly inclined, start to pump. Make sure the air is in a suitable degree, not too full. Warm Tips: - Do not push too hard, or the air needle will pierce the bottom cover. - The pump is not included in the package list. Package weight: 0.948 kg Product Size(L x W x H): 33.00 x 33.00 x 2.50 cm / 12.99 x 12.99 x 0.98 inches Package Size(L x W x H): 47.00 x 38.00 x 3.00 cm / 18.5 x 14.96 x 1.18 inches Package Contents: 1 x Yoga Massage Cushion Mat