Genuine Honda Civic Type R N1 crank pulley. Designed for the Civic type R this pulley only weights 1.8 pounds. With over 8 lbs in weight savings over factory this pulley is fully balanced from Honda and will reduce the weigh the motor must turn and frees up more power for the wheels instead of turning useless weight. It's like installing an expensive lightened flywheel. Your motor will rev faster and it will not cost hundreds of dollars in parts and labor. It has all the factory timing markers, works with factory crank pulley tools, and is zinc plated.