Gymstick Office Ball allows for an ergonomic sitting position in the office or at home. Sitting on an office ball, the middle body is activated, preventing static tension in the back and back pain. In addition to sitting, the ball can also be used as an aid in muscle fitness training and stretching. The ball is covered with a comfortable polyester fabric. The printing sand inside the ball and the non-slip surface material at the bottom hold the ball in place. Maximum user weight: 120 kg. Available in two different sizes: 65 and 75cm. Includes: hand pump.