Necessities by Aurifil thread kit of 4 Large (1422 yard) spools of 50 Weight 100% cotton Mako thread from Aurifil. Includes the following colors: 2000, 2021, 2600, 2692. Long staple Egyptian cotton is the best in the world The 50 weight is the finest of the Mako threads and is very smooth and strong. 100% mercerized cotton.