Our commercial backbore, perfect for studio musicians and those who want to be! This is a copy of a backbore designed by the legendary Johnny Madrid. This backbore’s sound has great sizzle, core, and enhanced upper harmonics. It has been described by our customers as being similar in feel to a Warburton New York NY or Q backbore, although not identical. The shank is based upon a #5 sleeve to make sure almost all horns will receive it properly. The throat is a #27. This backbore is available in two blanks. The lightweight blank is less efficient and will have a slightly tighter feel. The heavyweight blank is more efficient and will feel slightly more open.