Cose's 1mm white elastic bobbin thread, 25 meters long, is the essential elastic thread for creating a smocked effect on fabrics. At 1mm thick, it's wound onto the bobbin of a sewing machine to create automated and delicate gathers on dresses, blouses, and cuffs. The white color ensures invisibility on light-colored and lightweight fabrics. Perfect for seamstresses, tailors, and women's fashion designers.