Thread Heaven is a patented synthetic compound used to condition and protect thread. It is designed for both machine and hand sewing. Thread Heaven does all of the following and more: binds thread fibers to prevent fraying, strengthens and weatherizes thread extending the life of projects, makes thread resistant to tangling and knotting, reduces friction, reduces stress on thread, reduces hand and wrist fatigue, and it is acid free and non-toxic. Thread Heaven will not bleed, melt, freeze, stain or stick to projects. It is safe for all threads and fabrics. Sold Individually $4.50