Cases for Märklin Z Scale.
They are stackable when you remove the support material on the bottom.
There are also lids available if you want to close it.
You can use these cases by themselves or as insert in the original cases.
The white inserts in the pictures are original ones and the black ones are the printed ones.
The number in the name equals the number of the original insert.
The author marked this model as their own original creation.