Tonepros USA/Imperial Nashville Roller Bridge

Due to fitting a bigsby vibrato unit to a Les Paul and and an SG, I decided to order 2 of these roller bridges in imperial. Needless to say they dropped straight in without any problems. The holes for the bridge posts are quite tight and the bridge has to be put on exactly square to the posts. Only a couple of strings needed intonation. The allen screws to nip the bridge to the bridge posts isca great idea but a little fiddly. My main gripe with these is once everything is tuned up and one starts to play, there seems to be a tiny but irrritating vibration that eminates from the bridge when plucking the strings. Probably its the rollers vibrating on their axles or spindles. I assume these rollers are stainless steel as they are not coated in nickle as is the rest of the bridge. I would've liked to see an option for brass rollers too, but couldn't find any. However, this didnt seem to make any impact on the tone of the guitars once in place. In that respect , for those reasons they got 3 out 5 from me no brass roller options and vibration off the saddles when playing was a disappointment. Other than that these are really good for helping to keep a Bigsby in tune.