These nano caches are made from anodized aluminum, making them more corrosion and wear resistant. The camo pattern was manufacture painted to hold up for years no matter what the elements may bring. They have a strong internal glued magnet and an o-ring for weather protection.
Each one comes with a Rite in the Rain® log sheet included.
Recommended replacement Rite in the Rain® log sheets:
5/16" x 11" 24 Pack
https://spacecoastgeostore.com/products/rite-in-the-rain-log-sheets?variant=42994411765891
1/2" diameter x 3/4" tall (12mm x 18mm)