Aurifil Cotton Thread — Sand 2326 — Medium 40wtLooking for the coordinating Kona Cotton? Try Kona Scone Aurifil thread is known among quilters as the best cotton thread you can find due to its versatility, strength, lustrous colour, and the fact that it produces virtually no lint. The 50wt thread is wound on an orange spool is the ideal weight for piecing because it results in flat, non bulky seams. It is a fine, strong thread that virtually disappears. The 40wt thread is wound on a green spool.