Diabolo
Overview
 
The diabolo is a juggling
Juggling
Juggling is a skill involving moving objects for entertainment or sport. The most recognizable form of juggling is toss juggling, in which the juggler throws objects up to catch and toss up again. This may be one object or many objects, at the same time with one or many hands. Jugglers often refer...

 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. Diabolos with more weight tend to retain their momentum
Momentum
In classical mechanics, linear momentum or translational momentum is the product of the mass and velocity of an object...

 for longer, whereas small, light diabolos can be thrown higher and are easier to accelerate to high speeds.
 
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