These are threads used for patchwork. They can be used for piecing, edge finishing, button sewing, etc. I was making large projects, so I bought them in bulk and these are the leftovers. I stored them in a box, so there is no fading or discoloration, but the stickers on the spools are starting to come off due to aging. Some of the printing is also faded. Mettler metrosene plus Art. 1171 100% polyester 100m per spool Color Lot No. 0703 No. ―3 The numbers may be different A set of 5, including 2 off-white and 3 black threads.