Thank you for viewing. This is a tuba mouthpiece made by Monster Oil. Super G (Geib Model) American shank. There are insertion scratches from use, but there is no damage such as dropping. The original box is included. From the product homepage: Lube Master ''Super G'' by Monster Oil There is a legendary tuba mouthpiece called Conn Geib. This is a mouthpiece by Fred Geib, a disciple of Mr. Helberg. Mouthpieces based on his mouthpiece are sold by manufacturers all over the world. After researching the mouthpieces of the time and the currently sold Geib models and repeated prototypes, the tuba player involved in the development praised it as the "Holy Grail," and the mouthpiece was completed. To all tuba players. The birth of Super G. Inner diameter: 32.80mm Cup: Medium Shank: European or American ~About Fred Geib~ He aspired to be a tuba player and, at the age of 15, was taken by his father to become a disciple of August Helberg, one of the most famous tuba players. At the age of 33, he played as a tuba player in the Philadelphia Orchestra, and then in the New York Philharmonic Orchestra under the great conductors Gustav Mahler, Richard Strauss, and Jean Sibelius. Geib taught tuba at the Juilliard School of Music in New York City for 20 years from 1930, sending many tuba players into the world. Then, he was active as a tuba player in the Radio City Music Hall Orchestra until three years before his death. Also, at the time, he appeared in many historical professional bands such as John Philip Sousa and Edwin Franco Goldman. Geib was involved in the design of many tuba mouthpieces sold by C.G. CONN.