I bought a solid body Kala U-bass and wanted flatwounds for it, but accidentally bought the ukulele u-bass flat wounds by accident. (I needed the 23.5" set. This set are for 20.5" scale length. Duh).   Packet opened, but strings were never actually put on the bass, obviously, so basically brand new. Currently cost £55 from Thomann, plus £10 P&P.    Postage included in the price.