Headphone based on the Grado sr325i, this edition has been modified to fit George Alessandro demands.
From Alessandro High-End Products site:
All metal work for the Music Series Two is machined from a special non-resonant, very hard alloy. A special processing method is used to increase the materials porosity. This complex treatment insures that the earphone chamber has no "ringing" which might obscure detail or add coloration. The Music Series Two model also utilize UHPLC in its connecting cable.