These DecoBob pre - wound bobbins are great for sewing enthusiasts and embroidery lovers. Use them in your regular sewing projects or when you're doing detailed embroidery work. They come in a pack of 36, with each bobbin having a size of L (100m / 110yds). The thread is a 2 - ply cottonized polyester, white in color. It's perfect for anyone looking to make their stitching less bulky and their designs softer.