Rik-rak is a term for a narrow, flat and semi-flexible band that is deliberately woven into a zig-zag. They are normally, but not inevitably, monochrome in appearance. Rik-rak is usually between 0.5 and 1.5 cm in width. This form of band was developed in the late nineteenth century, initially to finish seams and hems and later as a form of decoration, especially on garments.