key features: 1) Low ride height ability 2) Fully threaded damper & lower mount allows vehicle height to be adjusted independent of the spring preload and without using a helper spring 3) Large range of rebound adjustment is available at the turn of a knob on the top of each damper 4) Allows full soft to full hard damping change in just 12 clicks 5) Replaceable & Custom Tunable Damper 6) Custom spring rates are available to special order with a proper damper tune (4-32kg) You can choose +/- 2kg with the built in adjustments without spending more money for a custom damper tune. 7) Pillow ball upper mount on front AND REAR 8) Spring upper perch provides independence between the spring and the pillow-ball 9) Billet T6061 lightweight aluminum Lower mounts with urethane bushing 10) All aluminum components are hard anodized 11) 2 collar wrenches are included 12) Lifetime manufacturer defect warranty