The Vintage The Master Key Chromatic Pitch Pipe Instrument by W.M. Kratt Co. is a tuning pipe with 13 keys, designed for musicians to accurately tune their instruments. Made of durable metal and featuring a compact, lightweight design, it is easy to carry around in its included bag or case. This classic piece was manufactured in the United States, adding to its vintage appeal and authenticity. Ideal for musicians looking for a reliable and portable tuning tool with a touch of nostalgia.