Aurifil Cotton Mako Thread. 100% Long Staple Cotton. 1422 yard spools deliver superior strength and thinness, for flatter, more accurate quarter inch seams and more precise piecing. Aurifil also delivers virtually lint-free thread, so you can say goodbye to tension issues, broken needles and gummed up machines. Choose from a range of neutral colors for piecing your projects. Pewter is one of my favorite dark basic colors.