REVO coils provide improved plush ride quality, control, and resistance to bottoming-out. Their extended coil length has larger "sweet spot" without increasing overall shock length and the unique spring rate offers the ability to soften pre-load, reducing ride height and maintaining a smooth ride. REVO-A shocks have six external knob adjustments allow fine-tuning of rebound performance for any given rider weight, personal ride quality preference, or personal riding style. Allows minimal pre-load adjustments when changing between riders' weights or loads Adjusts by hand, no tools needed Available in 12" and 13", standard or heavy-duty applications Easy installation and alignment, provided by spherical bearings on both top and bottom Available Anodized in Black, Clear, or Gold Backed by lifetime warranty