This model was developed with the help of Calicchio Artist Jay Daversa. Built the same a the standard 3/9 with the heavier Red Brass R3 bell. Slightly darker than the R37 and a little more open blow for those who feel the 7 leadpipe to restrictive. This is a very versatile instrument. From a beautiful warm tone to a sizzle when pushed. Also available in R- 39M(.453), and R-39L (.468). R-39ML (.460)