Hiflofiltro is the world's first and only TÜV approved motorcycle oil filter. Constructed using the best materials available, all Hiflofiltro oil filters meet or exceed original equipment performance levels. Advanced high performance tri-fiber filtration media for optimum filtration, high capacity, and improved oil flow. Capable of capturing particles as small as 5 microns. The Race Filters "R" have a 17mm cross drilled nut enabling easy removal and lock wiring for race use.