The closed chain cover design provides safety protection for the baby the anti-slip effect is more remarkable and the riding is safer. Maintenance-free brake system front and rear mechanical disc brakes good braking effect not easy to wear and reduce the inertia of the brakes bringing safety and pleasure to the ride. Manufacturered by Axdwfd. 18" 20" 2 size blue red bicycle foldable 6-speed shifting sprocket wheel seat and handlebar height adjustable with safety auxiliary wheel triangular stable anti-drop structure auxiliary wheel makes children ride safer Longer service life. Easy to piece together! 95% of the bikes have been assembled and the handles seat cushions auxiliary tires and pedals can be installed in just 4 steps. Thickened folding carbon steel frame adopts moving tripod structure to distribute the power evenly to the whole vehicle sturdy double argon arc welding process environmentally friendly electrostatic baking varnish folding frame design.