100% Cotton | Size - 3.8cm in length,3.6cm in width / 1.5 * 1.4 inches. | Durable Plastic: Plastic bobbins are stronger and waterproof than cardboard bobbins can reusable for many years. Flat shape with smooth finish and not easy be bent, so the floss doesn’t snag. | Unique Design - There are two thread clips on each board to keep the end of the line stuck, also you can labeled these with marker pen for easy reference. | Organize Thread-Thread bobbins perfect to keep remaining thread, skein, washi tape organized, untangled. Easy to label them with marker and ready for your next using. | Wide Application - Help you to save thread, skein, washi tape,let you convenient to use, in case various threads will be in chaos.