This lint-free, double mercerized 100% organic cotton thread is spun from the finest long staple Pima cotton, grown without the use of chemicals and pesticides. Each spool is wound around biodegradable wooden spool cores. Rest assured your thread is GOTS - Global Organic Textile Standards and Oeko Tex-certified. During production only natural dyes, natural lubrication and a very stringent mercerizing process are used. Perfect for quilting, top-stitching, decorative machine stitches, crafting, and embroidery and fits all standard sewing machine spindles. Included colors are Winter Sky, Blue Shadow, and Bellwether Blue. Recommended needle is US size 10-14. Denim Blues thread set, 3 spools of 500 yds, 50 weight, 100% Organic extra long staple Pima Cotton by Scanfil.