Although I use these on all my normal bars, I mostly got these to use on some of the specialty bars I own ( i.e swiss multi grip bars, farmer's handles, and bars with smaller collar diameters).So far they work great and seem like they'll last. As the cliche goes, time will tell.Design wise, each collar is made of hard plastic that has been put to the test at my gym - I run a strength and conditioning facility where equipment is definitely not coddled. They come on and off the collars of any bar very easily thereby increasing time efficiency while working with clients. You'll have no problems with the collars slipping off or sitting loose on whatever you choose to put them on. This is great for peace of mind especially during dynamic exercises, or when loading the bar with substantial weight.It's a plus that they come in various colors to match your gym or personal style. This is a well made product that exceeded my expectations and has been very useful at my gym for a variety of exercises. I dont think you'll be disappointed with this purchase regardless of price point.