Markertek News Channel coverage of the new KSM313 & KSM353 Bi-Directional Ribbon Mics with Roswellite Ribbon Technology at AES 2009, NYC. Proprietary Roswellite technology provides revolutionary ribbon resilience and durability under extreme conditions. Hand assembled in the USA from state-of-the art transducers, transformers and metals as the pinnacle of Shure quality for prestigious vocal and acoustic performances.