1. The strings are made of quality Nylon Satin, with enough stiffness and durability. Come with plastic spools, never tangled or any mess, and easier and more convenient to use.2. The nylon satin cord is lightweight yet durable, pliable yet solid, able to stand repeated pulling and knotting, hardly fading or breaking. Various colors are enough to meet your crafting and mixing demands.3. Suitable for beading, macrame knotting, ornaments making, costume and garment making, tassels, crafting, wrapping, beading, Chinese knot making, wind chime making, and even handmade sign making.4. Please measure the size before tying the knot. Due to manual measurement, there may be some errors in size. There may be slight color differences due to differences between different monitors.