Keep your knives and firearms protected from rust, with the Qmaxx Products BLU Gun Oil and Rust Barrier Large Pen Applicator. The pen applicator makes it easy and convenient for you to apply the product to your knives and firearms. It has been tested through various rigorous and practical applications. The test results exceed leading products in the marketplace by up to 300 percent. Q20 BLU protects the bluing of barrels and steel parts from corrosion and moisture, prevents rust inside chambers, displaces and prevents moisture on knives and lubricates mechanisms and moving parts.