You need some Circular Pins to assemble the model.
Here is the list:
Φ2 10mm x2 (for the middle connection rod)
Φ2 16mm x1 (for the handle bar)
Φ2 14mm x 1(for the seat post hinge)
Φ2 18mm x1 (for the pedal)
Φ2 20mm x 2(for the front Pillar & Top cap Mounting)
Φ2 8mm x 1(fot thr rear Pillar Mounting)