MOWA Aluminum Alloy Road Mountain Bike Bicycle frame Protector Derailleur Cable Spacer Donuts

In this kit, you get six of these, which are more than enough to cover mulitiple sides of exposed cabling. Other reviewers have most commonly pointed out two issues:1. These are too loose for the cables. That is absolutely not the case in my experience. In fact, I had to quite literally twist these on and into place and they do not move once in place. Yes, I used these on brake cabling, but I also put one on shifting cabling and while easier to put on, they were most certainly not loose.2. These are overpriced and donut o rings work better. First of all, at the add on price, there are actually cheaper than any o rings you can get on Amazon, short of ordering from China and waiting for a month or more. Sure, if you have an LBS that's near, you can likely get o rings for free or nearly free, but if not, these are a better bet than ordering o rings be themselves. With that said, again, these definitely are a little more effort to install than o rings, but not obscenely so.In short, these are cheap, look decent, and work well. They do require a little effort to install, but won't take more than 5 minutes or so. I'd buy them again, especially at the add on price.

The diameter seems just a bit big. These are going to rub all the time on my old Stumpjumper.

Just stick to the rubber doughnuts