2 Colors and Size -- The package comes with 36 pcs prewound bobbin threads in 2 colors(black and white), 18pcs per color, the classic colors and rich amount are enough to meet your daily DIY sewing needs, the thread is about 0.2mm in diameter, ideal to add into common sewing projects Comfortable and Durable -- The thread is made of premium polyester, ensuring its sturdiness and long-lasting use. It won't easily break or fray, smooth and comfortable to touch, also color-lasting, providing a reliable option for your various sewing projects Easy to Organize -- Plastic storage box will be a great help for you to storage these prewound bobbin threads, the bobbin box will prevent each small spool to be tangled, helps you to work with embroidery thread effectively. No more mess Widely Used -- The prewound bobbins threads fit most of the commercial, home embroidery and sewing machines, widely used in cloth and textile industry, which will be an ideal choice for clothes repair and fabric handicrafts Sewing Gift -- The plastic sided prewound bobbin threads have clear plastic sides that will not distort or absorb machine oils, it is an ideal gift for your family or friends who like sewing or DIY crafts, which will meet most of their needs of sewing crafts