Magnesium alloy and aluminum alloy construction creates a lightweight 8-lb balance bike that helps kids practice steering and balance before using pedals. The 12-in pneumatic rubber tires and anti-slip handlebars work together for stable, smooth riding on different surfaces. An 8 x 5 in ergonomic seat with a locking device adjusts to fit a 14-16.5 in inseam, so the same bike can suit growing riders. An extra footrest gives kids a place to rest their feet while they glide forward.