These DecoBob pre - wound bobbins are great for embroidery projects, whether you're making delicate home decor or personalized gifts. They're perfect for hobbyists and professional embroiderers alike. Each pack comes with 36 bobbins of size L, which is 100m or 110yds long. The thread is a 2 - ply cottonized polyester in white, offering a great balance of strength and softness.