Golden Semi-Synthetic Cartridge Fork Fluid Spector Cartridge fluids are formulated specifically for service in modern inverted cartridge style forks. A semi-synthetic blend of the world's leading base stocks, as well as anti-foaming and anti-wear additives, "Golden Cartridge Fork" provides zero station, conditions seals, and provides smoother operation. Designed for use in Kayaba, Showa and Mar Zocchi forks