Keystone Light Mainspring Lubricant withstands pressures of over 300,000 PSI. The outstanding film strength allows mainsprings to release with smooth and even power for years without binding, rusting, or galling. Displaces moisture caused by insufficient drying or high humidity conditions. Stays where it's put. Contains no graphite or sulphur. 8 fluid ounce bottle. Semi-Synthetic Lubricant.