Innovative, resilient stainless steel cufflinks like these are often times impossible to find. Well, your search just ended with Cuff-Daddy. Black coating is applied with a PVD (aka physical vapor deposition), a process whereby a coating is vaporized and applied to the cufflink through a vacuum process. The result is an incredibly resilient coating that will never chip off the cufflink. We carry this product in other colors so please browse our site.