Please refrain from purchasing if you are seeking a perfect product, as this item is used. Please be sure to read the profile to prevent any issues. It appears there are fine cracks in the adhesive on the back from the time of purchase. See image 6. There is no impact such as wobbling. I have wiped each individual square, but I have not been able to remove all dust, etc. Acrylic pen storage case Allows you to see the contents from the outside 18 rows x 5 tiers, for a total of 90 compartments External dimensions: Approximately width 365 x depth 110 x height 270mm Internal dimensions of one compartment: Approximately width 18 x depth 108 x height 51mm <Reference> Number of pens that can be stored in one compartment when storing Copic markers Sketch: 4 Ciao: 4 Classic: 3 Copic Ink: 3