THREAD SPOOL: Features one 2,200 yard spool of Superior Threads MonoPoly 100% polyester thread that is extra fine at 0.004" (.1mm) in diameter (90 denier) INVISIBLE THREAD: Strongest invisible thread on the market, MonoPoly is commonly referred to as an invisible thread due to its fineness and reduced-sheen, great for the bobbin or top PERFECT FOR CRAFTING: MonoPoly threads are great for quilting, appliqu, apparel, or wherever reduced sheen invisible thread is required MACHINE USAGE: For best results with home machines, use Topstitch #70/10 needle - lower top tension; For best results with longarm machines, use #14 needle (MR 3.0) - lower top tension International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.