Grado RS1 Classic Series HeadphonesA Grado Original Few headphones represent the history of Grado more clearly than the RS1. Introduced more than three decades ago it was the first wooden headphone in the Grado lineup and quickly became one of the defining models of the brand. Originally constructed from mahogany the RS1 helped establish the relationship between natural materials and the Grado sound. 50mm X2 Dynamic Driver At the center of the RS1 is Grados 50mm X2 dynamic driver