This 12-spool assortment contains 12 spools of article 40S (40 weight Cotton Thread, 700 yards). 100% cotton. These are neutrals. Included colors:40S-SN70440S-SN70540S-SN20140S-SN70740S-SN21240S-SN20940S-SN20440S-SN00440S-SN00640S-SN21540S-SN70040S-SN001