MachineartMoto X-Head DOHC Engine Guard for BMW R1200 / R1200GS / R nineT X-Head DOHC covers 80 of the face of the cylinder head to protect not only the bottom initial impact area in a drop, but also the upper part of the cylinder head. Even in a driveway drop, the inertia of a fall may cause a bike to roll briefly onto the face of the cylinder before it settles down on its bottom edge. X-Heads cover more area than OEM and other aftermarket head guards. X-Head DOHC are molded in a DuPont SuperTough nylon selected for its blend of high-impact strength, temperature and UV stabilization. The injection molded shell is designed to give slightly in the event of an impact to prevent breakage. Between it and the cylinder head is a 7mm thick thermoplastic rubber liner that aids in dissipating impact force while preventing hard contact with the cylinder. Each side mounts via the included 3 stainless steel fasteners coated with Nyloc thread locking compound to assure a tight installation. If your crash bars have had an impact, check that there is still a minimum of 15mm clearance between the crash bars and the X-Heads. Sold in pairs.