This is an incredibly rare Table G Selmer Air-Flow Tenor mouthpiece. You never see mouthpieces of this vintage with this large of tip openings!!! The piece measures out right at .096", and has a huge sound. The response is great, and the overall sound is focussed, but has loads of power due to the large chamber. The mouthpiece also has a serial number to the right of the table, which is pretty rare for Selmer mouthpieces. This is a very rare 1930's vintage moutpiece in great shape, and an unbelievable player.