Diabolos
Diabolos evolved from the Chinese yo-yo, which was originally standardized in the 12th century. Chinese yo-yos have a long thin axle, with disc-shaped wheels, while the western diabolo is more cone-shaped. The diabolo is a juggling prop consisting of a spool which is whirled and tossed on a string tied to two sticks held one in each hand. A huge variety of tricks are possible using the sticks, string, and various body parts. Multiple diabolos can be spun on a single string.
Diabolos come in different shapes and materials. Large/heavier diabolos tend to retain their momentum for longer, whereas small/light diabolos can be thrown higher and are easier to accelerate to high speeds. Rubber diabolos are less prone to breakage.
