These came out of a fretless Jazz and I've replaced them with an old pair of Di Marzios. They're well used and the cover of the bridge PUP is either worn or has been replaced (SD logo has gone). However they work 100% fine and sounded very nice in the Jazz to be honest, kinda makes me wonder why I changed them, but such is life £40 for the pair posted seems fair, they retail at around £80 per PUP from Thomann https://www.thomann.de/gb/seymour_duncan_stk_j2n.htm and https://www.thomann.de/g