Double sewing machine needles are the first choice when it comes to special effects in decorative and top-stitch seams. Tucks or one or two-colored seams can effortlessly be made here. The twin needle shows its abilities especially in elastic and highly elastic materials such as t-shirt fabric or knitted goods. These double sewing machine needles with flat shanks are specially designed for zig-zag sewing machines, but fit all conventional household sewing machines and are available with various needle distances.