***UPDATE 1/19/19***I've owned these for almost exactly 2 years. I just reinspected them and they still look like new upon quick glance. There is minor surface corrosion between the ball bearings. VERY unnoticeable. When pulling the shower curtain, ALL of the shower rings glide on my metal shower rod. Yes, every single one of them. What some of them do NOT do, is have the ball bearings roll/spin while they glide on the rod. This doesn't bother me all because it's still fully functional. It's metal on metal, hence why they glide without rolling. If the rings were on a rod that had caused more friction in order for the bearings to roll, they would. Point is, it's been 2 years and i paid $4 for these! I read someone else's review on here, and the guy gave these 1 Star because he had a hard time opening the plastic package. That doesn't warrant a poor review because of the packaging! Perhaps letting the manufacturer know about the issue and suggest an alternate package, would serve more useful. I'm sticking with 5 stars because of the price and operation after 2 full years.There's not a whole lot you can say about shower rings, unless you're Dell Griffith. I would do my usual "Pros vs Cons" here, but there's really only 1 Con to mention, and it's not anything that bad. Over time, they do get some rust inside and in between the ball bearings, preventing them from rolling properly. I just bought these for $7 in an Amazon Lightning Deal because I needed to replace the same exact ones for the exact reason that i just gave. I had them for 6 years and i'd say they needed replacing after about 4-5 of those years. They work really well. I do recommend them. The packaging was a little challenging to get them out, while trying to avoid being cut by the plastic, but hey, that's just the packaging. My particular challenge was the interaction with them and my shower rod. Both of them gather moisture over time and can still gather rust. That prevents them from working properly. Take care of them and they'll last longer.I can offer up some quick tips for maintenance so that they last longer. If you don't mind replacing them every 4-5 years then you don't have to read on.Tips:-Keep the shower Rod Clean.-Use olive oil on a paper towel and wipe the shower rod. This will (temporarily) keep the glide smooth. You'll need to do this more than once.-Use a light to medium weight plastic liner and outside liner. The heavier you go, the more weight the rings have to pull.* Try to find a shower rod that is either one whole piece, or has an extension with a low lip. What i mean by this is most rods are adjustable, with one rod going into another. One rod is bigger than the other so that it'll fit inside, making it extendable. Here lies the problem: At the point where it extends, there's a lip. My shower rod happens to have a lip that the rings can get hung up on if they get seized up by rust. Trust me when i say that you'll go through shower liners because of ripping them through frustration when trying to pull the curtain shut or open*Thanks for reading! If you liked this review, you may like my other ones on various products helpful as well. Just click on my name, CodeRed, and give me a follow. Thanks again!