These DecoBob pre - wound bobbins are great for embroidery and other sewing projects. Whether you're a professional seamstress or a hobbyist who loves DIY, these bobbins will meet your needs. The size is L, with 100m (110yds) of thread on each bobbin, and each pack comes with 36 bobbins. They're perfect for adding detailed designs to clothing, making beautiful home decor items, or any creative sewing work you can think of.