the whole model is a modern copy of the 1865 year bike - a small post The wheel and the big to exaggerated front wheel, the whole bike except the brake, axle and motor, all the rest are the most advanced composite plastic, light but high strength. There are two of the most attractive spots. One is a tire, made of a kind of high elastic plastic, without the need to inflate, and naturally there will be no danger of a tire. Adidas used this material in a running shoe; the other is the seat, the whole seat is detachable, and the battery is inside. The detachable car seats are great, but they are more likely to be burglarproof.