This MK8 Filament Drive Gear is very similar to the MK7 and the Stainless Steel MK8 Drive Gear.
The only difference is that this little guy is made of brass and has 40teeth. If you're looking for an upgrade to stop filament sleep. You should try this one first. The metal knurl provides for seriously good grip!
Size: ID: 5MM OD:11MM Length: 11MM