Heavy-duty, hardened steel "T" frame base. Powder coated finish resists rust and corrosion. Extra large 13" front and 10" x 3.5" back tires provide a super smooth and quiet ride over any terrain. Adjustable frame for kids ages 5 to 7 years old. Features non slip plastic pedals, safety reflectors, solid mudguard, ball bearing wheels and adjustable chrome plated handlebars. Adult assembly required.