Buffet Crampon Antoine Courtois Tenor Bass Trombone AC424 Florida Accessories ICON 5J Large Bore Silver Plated ② The size is equivalent to 5G, and the rim is thin, so it feels light when playing, but it resonates well. *Another of the same model is also listed, but this ② has a wider impression than ①, which is a difference between individual instruments. I think you can use it regardless of European or American type. I used it for a while (2-3 months), so there are scratches on the shank due to normal use, but there are no dents or plating剥げ (peeling). (There is slight corrosion? dirt? on the rim) I would like to sell it to those who understand the above.