I've had a StayWell® Copper roller on my keychain for years, and it’s been a game-changer. Knowing that it's naturally working to keep my keys germ-free gives me real peace of mind when I’m out and about. Plus, it makes my keyring easy to spot in our basket of keys. I always find myself reaching for the copper roller first, as it makes a great way to hold my ring of keys and kills germs on my hand at the same time. Over time, the bright copper has developed a soft patina, but I know that its antimicrobial properties are still working. That’s what makes this product so great—it’s always active, requires no maintenance, and doesn’t need replacing or updating. Super economical, very effective, and well worth it. Highly recommend!