Built in high-density polyethylene (HDPE) with a thickness of 8mm, much lighter and "quieter" than aluminum guards, more robust and flexible than those made of carbon fiber. Designed to provide maximum protection not only to the base, but also to the front part of the engine block, the frame, the side casings, and, depending on the model, also to the shock absorber linkages. Very quick to mount and dismount, with instructions and screws included.