This purchase is for a set of engine guard crash cages for the 390 Adventure. The guards feature three mounting points on each side to prevent them from rotating in the event of a low side. It is also braced together in the middle to further increase its strength. The guards also include two black aircraft grade aluminum skid plates. Think of them is protection for your protection! Back by a 3-Year limited warranty for any material or manufacturing defects. Rest assured that you are getting best material commercially available.