These DecoBob prewound bobbins are perfect for sewing enthusiasts and embroiderers. Whether you're working on delicate garments or intricate embroidery designs, they'll make your projects a breeze. The size L bobbins come with 100m (110yds) of 2 - ply cottonized polyester thread. Each pack includes 36 bobbins, giving you plenty to work with. The white thread is great for a variety of projects and its special treatment makes it behave like cotton while being strong and stretch - free.