The Pony balance bike from RoyalBaby is the perfect combination of quality and style. This is a great first bike to teach children how to balance on two wheels. The seat and handlebars are adjustable to accommodate children ages 2-5 (13.718 inch). This bike assembles with no tools and adjusts with quick release levers. The frame is made from alloy and the 12 inch tires are air filled. The axles are metal as well as the headset for a smooth experience overall.