Ortofon OM Pro S pre-mounted on SH-4 Black The Ortofon OM Pro S pre-mounted on the SH-4 Black headshell gives you a practical and convenient solution for easily replacing your headshell and stylus on your S-Shaped Tonearm. The OM Pro S is an entry-level stylus that’s perfect if you’re new on the DJ scene. But also want to start with a decent level of professional equipment. Sporting a spherical diamond stylus, the OM Pro S minimizes scratching. While a solid cantilever means it can survive under heavy activity on stage. So no matter what your desired application, the OM Pro S gives you a remarkable entry-level stylus for any setting. While also offering outstanding sound quality.