Features: Thermochromic polyester sewing thread night glowing embroidery thread, which changes color with temperature variation, adding amazing effect to your crafting project. Package omes with 2 spools of Color Changing Polyester Sewing Thread, 550Yards Per Spool. Sufficient quantity to meet daily sewing and replacement need. Our thermochromic color changing thread yarn widely used for weaving, sewing machine, hand stiching, embroidery project, festival decoration, and more. Crafted from polyester, high strength, unique night glowing effect, not easy to be frayed. Great color fastness, not easy to fade. 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. Specifications: Component: Polyester Color: ColorB01; ColorB07; ColorB08; ColorB09; ColorB11; ColorFDY01; ColorFDY05; ColorFDY12; ColorFDY15 Thread Spool Size: Approximately. 4.9x3.50cm/1.93x1.38in Weight: Approximately. 45g Package Includes: 2Rolls of Color Changing Polyester Thread note: 1.Please allow 0-1cm error due to manual measurement. Be sure you donot mind before bid. 2.Due to difference between different monitors, the picture may not reflect the actual color