Integrated air and coil shock absorber Use a linear rate coil combined with dual-chamber air shocks for a smooth ride and ultimate suspension control One air chamber for bottoming control and adjusting suspension for the bike?s load The second air chamber adjusts ride height Inertia Active System (I.A.S.) with Inertia Valve technology separates wheel movement from chassis movement Shocks come standard with a manual fill system Shock absorbers sold in pairs Made in the U.S.A. FOR 02-06 VTX1300/03-06 VTX1800