Innovative stainless steel cufflinks featuring black highlights. Black coating is applied with a PVD process, which is also known as physical vapor deposition. PVD is a process where a coating is turned into a vapor and applied to the cufflink through a vacuum process. The result is an incredibly resilient coating that will never chip off the cufflink. This includes Cuff-Daddy's lifetime guarantee for product quality and you have a masculine set of cufflinks that will last a lifetime.