model: LEVi C12/A12 175mm,description: hydraulic cartridge, black,Replacement oil cartridge can remedy a sinking or rotating dropper

• Fully replace the functional mechanism of KS dropper posts
• May not work with OEM dropper posts
• These are also called "Oil Pressure Sticks" and "Air Pressure Sticks" In KS Service Documentation
• Fully replace the functional mechanism of KS dropper postsMay not work with OEM dropper posts