This is a Minoura FG540 hybrid roller. I sent it to Minoura for repair earlier this year because of a strange noise from the roller section. As a result, the bearing section is now FG542 specification. Of course, there are no problems with its use. I've only used it once or twice since the repair. #I have no complaints about its performance, but it's a hassle to set up, and I ended up only using my 3-roller trainer, so I'm selling it. Thank you.