It is a specialist in Big Band music. The cup is 0.5mm deeper than the model J1. The medium register will be better.
Inner rim diameter: 15,75mm
Outer rim diameter: 27,40mm
Cup depth 7,50mm / Throat 3,60mm / Nº 28
Backbore: P close
Rim shape options:
B sharp inner rim Similar to the classic American but more comfortable
L rounded inner rim shape