The E. Rousseau Jazz Metal Alto Sax Mouthpiece model ER2011 is a discontinued piece designed for advanced saxophone players looking for a medium cup depth and antique finish. The gold color adds a touch of elegance to the mouthpiece, making it a stylish choice for alto saxophones. With the reputable E. Rousseau brand behind it, this mouthpiece is sure to provide excellent sound quality and performance for jazz and metal genres.