RAVIN CROSSBOWS Serving and String Fluid is a non-wax polymeric lubricant specifically formulated for application to the center serving of crossbow strings. This fluid is odor-free and waterproof, ensuring optimal performance in various conditions. It should be applied at least once a year or before use in temperatures below 32 degrees Fahrenheit.Each container holds a net weight of 8g and is made in the U.S.A.