The face of the case will feature one of a variety of Sen no Kiseki II characters, both in regular art (34 styles), and in SD (10 styles).
As you can see in the image above, the front of the case features the character artwork, whereas you can see the details of the pass, and use it for swiping as needed. The case is made of acrylic, and has a chain included for it. Its dimensions are 101x59x6mm.
You can find more information on the Official Club Mag website. You can also find special goods for Sen no Kiseki with the link below as well.