I have no links with them personally, however APAJaws has them and I have seen them personally. You can literally tie the stuff in a knot and it won't break, plus the fibers are coated with some sort of thick plastic up until the point where they thread into your actual pin so they are VERY well protected. I am not really into super bright fiber on my 3D sights, and my hunting sight has protected wrapped fiber from the factory so I don't need it, however if I had a sight that needed fiber replacing with long fibers this is what I would use without a doubt.