These DecoBob pre - wound bobbins are perfect for anyone into sewing, embroidery, or any needlework. Whether you're a professional or a hobbyist, they'll make your projects a breeze. The 2 - ply cottonized polyester thread is strong yet delicate. With a size of L (100m / 110yds) and 36 bobbins per pack, you'll have plenty for all your creative needs. Use them in your sewing machines for consistent, high - quality stitching and softer, less bulky designs.