This new aerospace lubricant is commonly used on Nitrox/oxygen tank valve threads where silicone grease CANNOT be used. This black, oxy-compatible grease, not to be confused with white Christolube 111, contains molybdenum disulfide, a highly effective additive to prevent thread seizures and dissimilar metal electrolysis, while still maintaining a high degree of lubricity. Sold in 2 oz. plastic jar.