The SM 6155 Starter EGT (Epicyclic Gear Train) Rubber Set is a premium-grade internal dampening kit specifically engineered for high-performance Bosch-style (B. Type) reduction starter motors. These rubbers are designed to fit the planetary gear carriers found in Volvo passenger cars and light commercial vehicles. Positioned within the gear assembly, these dampers serve as critical shock absorbers that neutralize the sudden mechanical torque and "kickback" during the ignition of high-compression Volvo engines, ensuring a smooth and quiet start every time.