Aurifil 50 weight Maki Cotton Thread. 50 weight Mako Cotton Aurifil thread is the #1 seller in the quilting industry for a high quality thread. The superior, long staple cotton boasts high tensile strength and a wonderful silky touch. A higher thread weight indicates a finer (thinner) thread. Finer thread will emphasize your fabric choices and quilt design. The most popular weight of Aurifil Thread is their finest, 50 weight thread.