Handicraft Rubber Katane Thread Made in Japan, 20m x 2 rolls Unused. The outer bag has dirt and wrinkles, but the product itself is clean. Shirring: By using it as the bobbin thread in a sewing machine, you can easily create fine gathers (shirring) on the fabric. It is suitable for items like aprons, blouses, and the cuffs and waistbands of children's clothing, as shown in the package illustration. Stretch Prevention and Reinforcement: It can also be used to prevent stretching and reinforce areas that tend to stretch, such as knit fabrics.