This lubricant used on your spool of thread helps avoid splitting and fraying. Works especially well with Metallic and Iridescent Threads. A handy silicone lubricant. Apply sparingly to sewing machine thread. Lubricates thread guides and tension mechanisms as the thread passes through the machine. Apply to needles, hand and machine. Makes for smoother sewing and easier penetration of the fabric. Apply to the bottom of the presser foot and other attachment. Makes them glide over fabrics more easily.