Our tightest backbore. The Manhattan has great sound focus and nice resistance. It is specifically geared for the needs of players on those extended performances and all night gigs. 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 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.