Progressive Suspension's 990 Sport Series shocks features complete adjustability with an adjustable height eyelet, rebound damping adjustment, High & Low Speed compression damping adjustment via easily accessible knobs, and threaded hand adjustable spring preload. The 990 features a high-pressure monotube with deflective disc damping routed through two unique circuits delivering a consistent feel through the damper stroke for improved performance and stability. Progressive's new and improved engineered jounce bumper features a captured design to help smooth and control bottoming. Every shock is hand-built, tuned and dyno tested in their facility and backed with a lifetime warranty. Engineered for aggressive sport inspired riders, the 990 sets the mark for excellence on your V-Twin motorcycle! Adjustable Height Eyelet - 0.4" Adjustable Rebound Damping Adjustable Preload by Hand Adjustable High & Low Speed Compression Mounts using bushings High Pressure Gas Monotube Deflective Disc Damping Lightweight Aluminum Body Linear Rate Coil Spring Captured Jounce Bumper Lifetime Limited Warranty