The display cases can come either clear back or mirror back, that is up to you. And they also can come with dividers or without, again just let us know what you would like.
As for dimentions, I suppose I should have posted that as well. Here is a quick run down for you. I am sure you will be very happy with cases, they are excellent quality, and I personally use them for my collection.
Item # Size 9964 31 3/8" W x 22 3/4" H 7264 23 7/8" W x 22 3/4" H 5664 23 3/4" W x 15 1/8" H (actual item number is 56064) 3064 17" W x 11 3/8" H
My favorites are the slanted 99 car display case. I am setting up a new room for my collection (I have just a couple) and will be using about 12 - 14 of the 99 Car Slanted cases in the new room. Also plan to get 4 more to make a cool middle display unit for the center of room.