"Serie Oro" brake discs: 100% interchangeable with standard discs, these are the choice of motorcyclists familiar whit Brembo quality and willing to accept nothing less. -"Floating" brake discs: In this design, the discs proper is made of stainless steel and connected by way of 10 drive pins to a hub flange cast from light aluminium, machined on CNC equipment and then anodized. Brembo "floating" discs are manufactured from materials of the highest quality and deliver performance second to none. "Fixed" discs: Fashioned in one piece from stainless steel, these are discs design and constructed to produce a faultlessly engineered package: ultra-close manufacturing tolerances and selected machining cycles guarantee flatness and concentricity that will recommend Brembo "fixed" discs to the most discerning of motorcyclists. NB: "Serie Oro" discs are made to the same design as their OE equivalent; accordingly, if the machine came whit a floating disc, then the Gold Series replacement will also be a floating discs. For easy identification, the first two digits of the part number indicate the type of disc: 78 for floating, 68 for fixed