The stickers are made of washi tape, i.e. rice paper with solvent-free adhesive. This gives them a slight transparency.
Another big advantage of this material is that the stickers can be removed from most surfaces without leaving any residue and can almost always be reapplied to another location.
Made from washi tape
Reusable, solvent-free, leaves no trace
Made in Japan
Dimensions: 18.3cm x 8.8cm