We can't recommend this product enough! This set of 4 Super Black Hole Oil Filter magnets cleans your engine oil while you ride. When oil is passing through the oil filter, the Black Holes pluck any ferrous metal particles right out of the oil stream, to stick to the magnet, which prevents premature wear of engine components like cylinder walls, cams, gears, etc. Installation literally takes seconds, and these are easy to remove and re-apply when transferring them from an old filter to a new one. Simply attach the magnets to the outside of your screw-on, exposed type oil filter and worry no more! Hot tip: Great for your car or truck oil filter as well!