High quality: The blue cassette sprockets made of transparent ABS plastic, lightweight but strong, long service life, as well as it has small size, so portable. The nylons on the brush are uniform, combined hard and soft, do not fall off, the scraper is also resistant, clean dirty corners. Convenient to use: Open the cassette and place it on the chain before closing it. Pour the cleaning oil (not supplied) into the hole provided for this purpose. Hold the cassette by the handle, without having to put your hands in the grease, you only have to turn the pedal until it is clean. Widely used: Fit all bicycle chains for example road bike / mountain bike / folding bike, full speed bike and many three-speed brake bike and roller coaster.