Wirezoll Secret Hollow Capsule Keychain-Stash Some Cash, Pills, Powders & More Aircraft grade lightweight aluminum alloy with neoprene 'O' ring Waterproof and wear-resistant Secure seal, Cover Screws on with Ease! Small Container Will Securely Stash Cash, Pills, Powders, Geocache and More Small Size of 1.75" in length (without keyring) and only .5" in diameter!