Bobbins are special spools that sit inside your sewing machine. Your machine will come with a few bobbins, but we recommend picking up more. Most sewing machines will wind the bobbin for you with a few adjustments. It’s a good idea to wind a couple bobbins in the colour you’re using so you don’t have to un-thread your machine to wind a bobbin in the middle of your project. Bobbins come in a standard sizes and can be plastic or metal. Check your manual to see which kind of bobbin is compatible with your machine.