420HC Stainless Steel
A thermoplastic material where strength is improved by adding chopped glass fibers. This allows for excellent durability without adding significant weight. In Leatherman knives, the glass-filled nylon handles are so strong that an inner steel frame is not required, thereby reducing weight for a lighter every day carry. Leatherman uses a 60% glass mix.
Black oxide is a powder-based metal coating. Ideal for situations where giving away a position would be costly, it is widely used by the military for its effectiveness in reducing glare and reflection.