This is an alternative label holder made from my previous design - the shelf label holder. This one can be glued to any flat surface using double-sided adhesive tape. The top and bottom edges of the holder are flattened so any items can slide over it. After attaching it just slide the label into the front slot and you are done.

As in the previous design, the default length is 60 mm but it can be stretched freely to any length. The whole shape is repeatable along the Z-axis.

The label can be made of paper or any other material. The slit is 1.5 mm wide so thicker labels can also be used. Bear in mind that the edges that hold the label limit the visible part by 1 mm on both sides.