Like our mothers always said a clean chain is a clean conscious. Keep your chain clean so it won’t grind down your cogs wearing them and your chain out prematurely. Now you don’t have to go through rags like they’re potato chipsthis scrubber uses an extra large solvent reservoir and a series of rotating brushes to get chains squeaky clean. It works with all multi-speed bikes and some single speed models. A sponge draws solvent from the chain while a magnet at the bottom of the 2 oz solvent reservoir draws particles away from the chain. And you thought it looked like a little piece of plastic. There’s magic in this thing!