The 490 Sport Series Shocks feature a high-pressure monotube with deflective disc damping technology, hand threaded preload and a rebound adjustment to dial in the ride. This technology coupled with a linear rate spring allows for consistent feel through the damper stroke and the ability to withstand extreme temperature ranges and heavy loads. From pounding pavement around town to hammering around the tarmac on your next race day, the 490 is the perfect choice for your performance demand! High Pressure Gas Monotube Deflective Disc Damping Lightweight Aluminum Body Adjustable rebound Damping Adjust Preload by Hand Linear Rate Coil Spring Jounce Bumper with Built-in Cap Lifetime Limited Warranty