This is the Hot Racing blue alum. rear adjustable spring damper (57mm) - 1pr for your Associated RC-18T Truck. This is the Hot Racing blue alum. rear adjustable spring damper (57mm) Team Team Associated RC18T RTR FEATURES: Aluminum construction, blue in color Shock bodies are threaded for easy pre-load adjustments INCLUDES: Two threaded aluminum shock REQUIRES: No Assembly need Just add the shock oil you like to use. Shock oil SPECS: Length: 2.44" (62mm) assembled Diameter: .40" (10mm) COMMENTS: If you like to use shock bladders it will accept the associated 18T shock bladders.