Hi, Emblove. Elegant Thread is distributed by a local Embroidery professional multi-head machine company where I am. It must be worldwide as I have a color card and it's from Switzerland, 320 colors is an Oeko-Tex standard 100 certification it's Polyester 40 weight 120/2 denier it has a color prefix K, have seen this somewhere used on a different brand, but just can't think of it , there are so many brands of thread, probably all come from the same factory!