Gutermann Invisible Thread 250m/274yd (736619), 10-pack, bundled with Bella's Crafts Needle Threaders. Each spool of invisible thread is made of 100% polyamide (filament nylon) that offers strength and flexibility to your handmade sewing projects and easily blends with all fabrics. They are ideal to use for quilting, sewing and crafting fabrics. Create a finished look for your creations using these fine and tear-resistant invisible threads.