AURIfil's Invisible Thread from Italy is smooth, strong and shiny but non-reflective, and made of 100% nylon. It comes in clear, for use in light fabrics, and smoke, for use in dark fabrics. It's the perfect choice whenever the thread color you need it difficult to determine or you want the thread to be invisible. Use it more often for just the top thread when you're machine quilting stitches such as stitch-in-the-ditch, invisible machine applique, echo quilting, or free motion quilting and use a coordinating AURIfil color in the bobbin. If you decide to use the invisible thread in the bobbin, you should wind the bobbin as slowly as possible and do not fill the bobbin completely. The strength of this "zero thread breakage" thread never fails, whether you're using it for hand stitching or long arm quilting. It's a lot of fun to work with and you will love the results. 16,400-yard cone. Specify smoke or clear.