Gerardo's Toys ergonomic ball for muscle training and active sitting. The seat ball activates the muscles of the abdomen, sides and back, exercises the body and helps to find the correct sitting position at the table. The ball is also very stable because the center of mass is where the lock is. It doesn't ride by itself and doesn't need to be chased around the room!
The ball can be inflated to a diameter of up to 85 cm depending on your body weight.
The pump is not included.