Design

Chinese yo-yos were traditionally made of bamboo, which was very easy to break and not convenient for complicated tricks. Modern models, however, are now made of plastic for added durability. The sticks used with the yo-yo continue to be made of wood.

Some Chinese yo-yos have grooves inset in the rim of the discs; these grooves cause them to make a whistling sound when spinning at high speeds. The sound allows the performer to gauge his speed and adjust the yo-yo accordingly.
The Chinese yo-yo has been adapted in Western countries as the diabolo. The Chinese yo-yo differs from the diabolo in two primary ways. First, the axle of the Chinese yo-yo is much longer than that of the diabolo. Also, the Chinese yo-yo has wheel-shaped discs, whereas the diabolo consists of two bell-shapes. The Chinese yoyo is also typically grooved and made of hard plastic, while diabolos are not grooved and usually made of a durable rubber material. For a comparison, see a picture of a Chinese yo-yo here and a picture of a diabolo here.