The bearings were cheap - a plus. However, I'd have bought twice as many if there had been something obvious on the page saying "WARNING - SINGLE UNIT! Typical installations require two of these bearings". I had assumed, as a single bearing is totally useless, that the pack would have two inside, but of course it was a single unit. Said single unit is now in my spares box and probably will be forever as I had to install different bearings that I had a pair of. I was initially very annoyed when I opened the pack to discover only one bearing, and I'm likely to choose another vendor next time, or indeed when I need to find the other bearing to go with the one I have because of this.