If you aren't familiar with the Painted Rocks app please visit the link above or Rocks.Art
These are quality vinyl stickers designed to be cut to size and applied to rocks. They are laminated and resistant to weather and fading for up to 5 years (many have lasted longer).
You are able to write the code on each sticker, then you have the option of releasing the rock --- or spray some protective coating over the entire sticker before releasing (to keep the code from fading or wiping off).
Sizing: Entire sheet measures 7 in x 3.75 in
10 sticker sheet (individual sticker size): 2.5 in x 1.1 in
16 sticker sheet (individual sticker size): 1.96 in x 0.93 in
25 sticker sheet (individual sticker size): 1.5 in x 0.75 in