They’re made by a company called Clayton. They also make brass and stainless—I’ll occasionally use the stainless, but it has zero flexibility(not that the copper is super flexible....). Incredibly aggressive attack, which comes in handy playing noise rock with boatloads of distortion and/or fuzz. Pick slides are shatteringly loud. They are string demolishers though; why I landed on the HiBeams—they seem to stand up better to the picks in addition to having pretty great clarity. Only drawback to the picks is, my thumb and forefinger look like they were dipped in newsprint after practice/gigs.