Flywheel cage

A flywheel cage is an internal part seen on most flywheel-powered blasters.

Details
The flywheel cage cases and holds a blaster's flywheels; without them, the flywheels would be unstable. In some blasters such as the N-Strike Elite Hyperfire, one flywheel is curved to improve accuracy. In all flywheel-powered blasters that are not ball blasters, with the exception of the Vortex Nitron, use a two flywheel cage setup.

Modification
Modders typically replace flywheel cages with metal cages because high-speed flywheels and metal flywheels can damage the stock plastic flywheel cages.