Properties: Spokey HALF FIT exercise ball with massage part: it is a perfect replacement for a chair, because sitting on it forces correct posture, has an Anti-Burst system, which causes the air to gradually release if the ball bursts, can be used during exercises and activities that stimulate blood circulation - one part has a smooth surface, the other is equipped with massaging protrusions, allows the spine to rest during long hours spent in the office or at home in front of the computer, comes with a handy pump that allows you to quickly and conveniently inflate the ball. Technical data: anti-burst system: if the ball bursts, air is slowly released construction: half of the ball has a smooth surface, the other half has protrusions that massage the body and stimulate blood circulation material: PVC weight: 1000 g diameter: 55 cm / 65 cm / 75 cm maximum user weight: 120 kg handy pump included;Properties: Spokey HALF FIT exercise ball with massage part: it is a perfect replacement for a chair, because sitting on it forces correct posture, has an Anti-Burst system, which causes the air to gradually release if the ball bursts, can be used during exercises and activities that stimulate blood circulation - one part has a smooth surface, the second one is equipped with massaging protrusions, allowing the spine to rest during long hours spent in the office or at home in front of the computer, comes with a handy pump that allows you to quickly and conveniently inflate the ball. Technical data: anti-burst system: if the ball bursts, air is slowly released construction: half of the ball has a smooth surface, the other half has protrusions that massage the body and stimulate blood circulation material: PVC weight: 1000 g diameter: 55 cm / 65 cm / 75 cm maximum user weight: 120 kg handy pump included