His mask is a very simple oval shape with two large eyes with 'tears' that cover/obscure Hisura's own eyes. It has one large horizontal and two diagonal lines at the top and bottom, the top ones have the outer two be yellow and the middle one be black, on the bottom its reverse. It has six indentations, three on each side, near the bottom lines that get smaller as they get closer to the middle.
While using it he has vastly increased physical abilities and can access various basic Hollow powers. His Reiatsu becomes black with a yellow outline and feels like a mixture of Hollow and Shinigami spiritual power. It has a time limit of 6 minutes and 20 seconds, although he can use it quite efficiently by removing it in between uses and to help stop him going out of control. He usually puts it on by hiding his face (such as looking down) and then gently but quickly 'placing' it on.
Hisura's inner Hollow is a small white gremlin-like creature with fairly large arms and a hole in the right right of its chest. It has a strong sense of honour but is quite stubborn. As it has merged with his Zanpakuto it is also his Zanpakuto spirit and can use Shikai. While semi-friendly, Hisura isn't fully in control of it; which is why he uses his Hollow powers as more of a last resort as he can easily go out of control while using them.