Thermochromic polyester sewing thread night glowing embroidery thread, which changes color with temperature variation, adding amazing effect to your crafting project Use these polyester sewing thread to brighten and beautify all sort of your embroidery craft, outdoor work clothes, handbag, crochet toy. Good elasticity of polyester thread, reducing risks of being tangles and puckering of polyester thread Our thermochromic color changing thread yarn widely used for weaving, sewing machine, hand stiching, embroidery project, festival decoration, and more Package omes with 2 spools of Color Changing Polyester Sewing Thread, 550Yards Per Spool. Sufficient quantity to meet daily sewing and replacement need Crafted from polyester, high strength, unique night glowing effect, not easy to be frayed. Great color fastness, not easy to fade