It’s made of aluminum alloy. This is the Aluminum Alloy Mini Pill Bottle with Keyring and easy to carry,. The pill cases have a small rubber seal ring, precision sealed water resistant, rust-proof and air tight, so that it can protect you pills, or alcohol swab, matches, cash notes. Suitable for outdoor activities camping, adventure, hunting, fishing, wild life-saving and parks, trips, bike riding, etc. You can take this little pill holder wherever you go and whatever you do. The price includes the shipping cost to ca. 100% guarantee for quality, Thanks for your order.