We try to choose natural, recyclable yarns. Strings from Polish manufacturers, most of them are STANDARD 100 by OEKO-TEX® certified. If a textile article carries the STANDARD 100 label, you can be certain that every component of this article, i.e. every thread, button and other accessories, has been tested for harmful substances and that the article therefore is harmless in human ecological terms (find more here). The strings we choose have the most natural composition possible (from 80% to 100% cotton) and lace ribbons (produced in United Kingdom) always 100% cotton.