Designed for children.Helps improve posture and sense of balance effectively. Locking castors.High back rest provides unparalleled comfort and helps blood circulation.Suitable from 3 years +.Please note:The balls for the chair will need inflating on assembly, using either an electric inflator or a manual inflator.Please inflate the ball to the size as detailed below. The ball is an anti burst fabric so keep inflating until the correct circumference is reached for this to fit the chair.39-41 cm in diameter(or a maximum circumference of 125-128 cm)Maximum load: 60kg.