Type Code: S46PR1C1S S: Single tube 46: Piston diameter: 46 mm P: Monotube high pressure gas type of shock absorber with external reservoir R1: Adjustable rebound damping on single tube shocks. Adjuster wheel above the end eye C1: Adjustable compression damping. Adjuster wheel or slot on the reservoir S: Hose mounted hydraulic spring preload adjuster.