Invaluable aid for all makes of white, off-white or cream colored descant (soprano) recorders crafted from synthetic materials, Highly recommended for the discerning recorder player with no "historic" snobberism attached - the thumbrest is a standard implement of practically all woodwind instruments. It complies with ergonomics and balancing issues ensuring stability, especially on notes requiring just one or two stopped toneholes. Perfect complement for the Yamaha YRS-402B, unobtrusive on its pale yellow body.