The YAS-200AD is the Yamaha Advantage student model alto saxophone.  It features nickel-plated keys for durability and a redesigned case make this the perfect Advantage Alto Saxophone.  Some of its other features include:  Refined key shape and dimension: Yamaha saxophone keys are not simply shaped and positioned according to mechanical necessity; the entire system is designed from the player's perspective, with emphasis on comfort, speed, and overall playability. The natural feel of the keys eliminates the need to adapt to an unnatural or uncomfortable key layout.  Adjustable thumb rest: All Yamaha saxophones feature an adjustable thumb rest to allow for precise and comfortable hand and fingering position.  Adjustable key guard felts for optimum intonation and venting, Power-forged keys for excellent durability, and Tapered pivot screws for precise adjustment and smooth key action.