• Fork: Aluminium,Frame: Aluminium • Handle Bar: Alumi • Head Sets: Steel • Wheel: Steel Rim + Air-Filled Tyre" • This balance bike is a perfect combination of quality & style. This bike is a great first step for children learning how to ride. • The seat and handlebar heights adjust to accommodate ages 2 to 5 years. The adjustable height of the seat about 13.7”-18”. • Quick Release, tool-free assembly. Carrying Strap is easy for parents to carry the bike. Unique patented seat has storage space for the strap. The strap is easy to use and simple to install. • Metal axle and headset for a smooth & strong ride. Durable alloy frame with air filled tires and 12" wheels, more comfortable on various kinds of roads. • Soft cushioned grips and padded seat are fit for even the smallest of riders.