Wall shelf

Here are some wall shelfs:

Two of them with a various width:

20 x 20 x 7 (cm)
20 x 20 x 12 (cm) (That one is design to store manga or pocket books)

And an other one which is less thick than the other:

20 x 20 x 7 (cm)

With wall mount, 2 screws where you want to place it and it's already finish !