This First Ride Balance Bike is three-wheeled and adjustable. The frame is made from lightweight aluminum alloy. The comfortable seat can be horizontally adjusted to suit your child's arm length. The wheels are made from TPU foaming material which is soft and flexible and will not scratch floors. Weight limit 25 kg (55 lbs). 40 x 58 x 29.5 cm ( 15.7 x 22.8 x 11.6 inches). 18+ months.