 "Cartridge emulators" are aftermarket parts that make damper-rod forks behave virtually as cartridge forks.The damping orifice in the damper-rod is made so large that it has virtually no effect on damping, and instead an "emulator" takes over the damping function.The emulator has a very small orifice for low fork-speed damping, and an adjustable shim-stack for high fork-speed damping.