Vibraphones are made of silver. They consisted of a sound chamber (the vertical part on the right) containing 2 small metal reeds that vibrated with the sound, and the ear canal extension (bottom left). Patent 044-1930, Silver No. 2. Vibraphone ear insert was made by the European Vibraphone Co. in London sometime after 1928 when the patent for it was filed. Charles Fensky a Lawyer in St Louis, MO received the patent for Vibraphone wich reads September 1931, they were produced until around 1935.  Post Net R110,