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Spinners, Wheels

Wheels are fireworks that are designed to be attached to a vertical support with a central nail. When lit, they spin around their center emitting showers of sparks, crackles, and whistles. They spin at incredible speeds, looking like a circle of blazing fire floating in midair. Most wheels are powered by several drivers which fire in sequence.
How Wheels Work:
Wheels consist of a cardboard frame to which are attached several small rockets, or "drivers". The device is usually attached by a nail to a wooden post. When the burning fuse enters each driver, the propellant burns rapidly to give off gas, which is forced out of the small nozzle to create thrust. This thrust spins the device around its axis.
Unlike most rocket propellants (which are designed to lift the rocket up into the air and not give colour), the propellant used in wheel drivers burns to produce rich colours, sparks, crackle, etc. Because the wheel spins so fast, it appears that there are "rings" of fire. When each driver is exhausted, the fire is transferred by another fuse to the next driver, which starts up again and continues the process (usually with a different effect). This usually happens so fast that the wheel doesn't have time to stop spinning.