mountain bike 24 inch for teenagers and female adults

1.frame: high carbon steel, lightweight aluminum alloy 2.fork: bold and shock absorption 3.variable speed: 20 finger dial 4.vice: there is a vice 5.brake: double disc brake 6.bottom axis: 3s sealed bottom axis 7.tire: dongyue tire 8.handlebar: one piece 9.saddle: ergonomic design 10.tires: thick, non-slip and wear-resistant 11.welding: fish scale process 12.seat: adjustable up and down