Coil conversion kit for Marzocchi Bomber Z1 forks. Legendary Marzocchi Bomber ride feel and durability ,Light-weight Tempered Silicon-Chromium steel spring (sold seperately). ,Air Assist for progressivity / bottom-out control. ,Spring preload easily adjustable via top cap. ,Noise management system for quiet performance. .Kit contains: Plunger Shaft ,Topcap kit.