Aurifil Cotton Quilting Thread - 40wt - 1000m - 5017Aurifil 40 is a great thread for any general sewing project. It can be used for piecing and for quilting, by hand and by machine. Aurifil Cotton Mako 40 thread is a medium weight (40 weight) 2 ply thread made from the finest Egyptian long staple cotton and mercerised for a wonderful sheen. Aurifil 40 is a fantastic general purpose thread and is very popular with long arm quilters because of its smooth character and its ability to be run at high speeds