Bushing type. A true sport performance shock at heart with competitive price. The Progressive Suspension 494 Sport Series Shocks feature a high-pressure nitrogen charged monotube design with deflective disc damping technology, hand threaded preload, and a rebound adjustment to dial in the ride. This technology coupled with a progressive rate spring allows for a consistent performing shock in a variety of real-world scenarios. An engineered jounce bumper with a built-in metal cup helps smooth out and control bottoming. From pounding the pavement around town to hammering around the tarmac on your next race day, the 494 is the perfect choice for your performance demand! Every shock is hand-built, tuned and checked for a bolt-on non-issue shock experience. - High-pressure monotube design - Deflective disc damping technology - Jounce bumper with a built-in metal cup against bottoming out - Hand adjustable spring preload - Progressive rate spring