They are more decorative than functional. Hard plastic, leaking and on a boat ramp I wouldn't trust my keys. I've placed them on top of a few other (non-boat) key sets for better visibility.
Titanium Keyring by BANG TI: Easy-to-Use Operation for Ultimate Convenience!
50 Review
Stainless Steel Husband Keychain with Stamped Relatives for Enhanced SEO
31 Review
TISUR Titanium Keyring with Side Pushing Design - Stylish Men's Accessory in Keyrings & Keychains
31 Review
Ultimate Titanium KeySmart: A Must-Have Organizer for Men's Accessories
49 Review