Gutermann Extra Strong 100% Polyester thread is ideal for fabrics such as denim, leather, furniture, tents and numerous craft applications. This high quality thread offers a high break point and is specifically engineered to cope with highly stressed seams. Extra Strong guarantees optimal sewing performance as it can be used in both the top feed and the bobbin on all standard sewing machines. It is also perfect for and sewing. It is a light weight thread that is "Extra Strong".