'08-'14 Lexus IS-F / '06-'13 Lexus IS250-IS350 ( 2013.5 -on use 1016104 ) Spring Rate: (Linear) Front: 12.0 K Rear: 9.0 K Adjustment Range: Front: 5-30mm – IS-F / 25-55mm – IS Rear: 5-30mm – IS-F / 30-60mm – IS Features: Externally Adjustable Damping Aluminum Spherical Bearing Upper Mount (Front & Rear) Low Profile Helper Spring Set-up The Hardened Chromed Piston Rod Low Friction Twin-Tube Dampening Compression Bump-stop with Integrated Dust Boot Hight Strength Linear Race Springs Corrosion-resistant Composite Spring Seats Galvanized Strut with Continuous Threads Includes all necessary components, adjustment tool and installation instructions