Material: Made of high quality plastic, lightweight, strong and durable, malleable, won't break, reusable and serve you for a long time. Convenient packaging: The package includes 40 jar clips in 4 colors, size: 7*2*0.4cm/2.75*0.78*0.16inch, good size for most spools and jars, helps you put jars and spools together, the clips can meet your different needs when using. Nice design: 4 different bright colors (light green, fruit green, yellow and light purple) to help you color code your sewing threads and bobbins. It is easy to separate the colors of threads and not mix similar colors. Function: It can be used to organize spools and keep spools and threads together. It is an ideal accessory for tailors, more convenient and time-saving.