REVO coils provide improved plush ride quality, control, and resistance to bottoming out. REVO extended coil length has a larger sweet spot without increasing the overall shock length. REVO unique spring rate offers ability to soften preload and/or reduce ride height while maintaining a smooth ride. Requires minimal preload adjustments when changing between rider weight or total motorcycle load. All suspension adjustments can be done by hand, no tools required. Easy installation and alignment is provided by spherical bearings on top and bottom. Available in 12in. and 13in. lengths in standard or heavy-duty. Black bodies with black springs. All REVO suspensions are assembled by hand. Sold in pairs. Made in the USa. NOTE: Heavy-duty applications are recommended for 400 lb. + rider and passenger total weight.