Hemline invisible Thread (14 ratings) 100% nylon £2.10 Quantity: at £2.10 each Add To Basket 3 in stock. Blends with any fabric, any colour. Use clear for light colours. For virtually invisible stitching on both sides of your work, use on bobbin and top. If using on top onl, increase thread tension to prevent bobbin thread coming up to top of work. Do not use auto thread cutter on sewing machines with invisible thread.