Professor Bicycle Metal Brake Linings Hummingbird Driving Electric Bicycle Mountain Brake Level Disc Brake Mt200 Brake Pad

The iron content is really high. People say the professor is a copper back version, but that's not the case. I'll use it for a while and come back with an update.

Switching to metal is even better than the original; it hardly fades on long descents. Just make sure to have a long downhill to break them in, or you might struggle to stop at first. I had about 5 kilometers of downhill to get them settled. I definitely repurchased and changed the front brake too, bringing back the feel of my old BB7 metal discs.