The GSC-1 is Park Tool's patented "GearClean" Brush has a unique design. A large comfortable handle with a curved, toothed-end reaches dirt deep between the gears, and tough nylon bristles clean the derailleur and chain. Saves wear and tear on your chain and freewheel. Works great on brakes or other places where dirt collects. (10 speed compatible). Handy size to take along for quick cleaning anywhere. Made of sturdy nylon.
See Also: Park''s BCB-4, a 4-piece complete bike cleaning kit
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5.0 GEARS 1 review
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I was a rag and tooth brush guy until I went ahead and bought one of these. For cleaning areas like the space between your teeth (on your bike cassette that is) this thing really makes a difference. It is very thin and the bristles are rigid enough to do push your degreaser down to the hard to reach areas and help to remove the old gunk.
I used one of these on a salvage bike I had. It was an old Cannondale with a Shimano cassette that was about as dirty/gritty as they get. With some good degreaser, a rag and this tool, that cassette actually shines.
The next time you are ordering something, add this to your order. I think it is worth the cost to ship it by itself, but if it's part of an order it is well worth it.