Rock Solid - Made especially for the AJP PR7 model of 3mm Marine Grade Aluminium these radiator guards ward off any ill flung stones from the front wheel. They are much tougher than the standard guards and the holes are cut in a honeycomb pattern that only very small stones can get through. This is not a cheap extruded mesh guard. They still have great cooling as well and they look great on the bike. They are bolt on items ( 2 x pieces ) and easy to mount.