The Fluidampr replaces your crank pulley to control the harmonics through all RPM ranges of your engine. The precision machined and balanced internal inertia ring inside the precision machined and balanced housing is constantly shearing through the silicone while the engine is turning, tuning to the harmonic frequency bandwidths that your engine is producing real time. Rubber (elastomeric) dampers are only tuned for a specific narrow bandwidth of harmonics and they cannot tune up or down to what your engine is producing. They also wear out and have to be rebuilt or re-tuned frequently. Our Fluidampr products never wear out or have to be re-tuned, as they are constantly balancing the engine to max efficiency via the internal inertia ring. Fluidampr also helps to calm down the chatter associated with double disc clutches.