Mettler-Cotton Machine Quilting Thread. Mettler top quality cotton sewing threads are made of 100% Egyptian long staple mercerized cotton. Soft, lustrous, shrink resistant, safe to iron, colorfast and fade resistant and even boil proof. Suitable for machine and hand sewing. 164 yard spool of cotton machine thread 40wt. Comes in a variety of colors. Each sold separately. Imported. The thread is slightly thicker and shows a beautiful decorative effect. Mercerization makes the thread stronger, heat-resistant and reduces shrinkage.