These hyperpro link system suspension springs are manufactured from DIN-2095 class 1 and are specially polished for minimal friction and have a lifetime warranty against breakage.First quality materials and precision machining.Thanks to the "Link System" technology, they provide road stability and optimal handling in all possible conditions.Tested in power bank thoroughly and in multiple situations.The kit includes: Springs. 1 liter of suspension liquid. A small tube of Hyperpro lubricant for fork closure. Professional manual with suspension tips.Valid for Harley Davidson Sportster (Various models). You can select it in the drop-down. Without a doubt, with these Hyperpro kink system suspension springs you will feel the road again as the first day.