This is a Gotoh S510B-4 Gold bridge for a 4-string bass. I used it for about three months after purchasing it, but I'm selling it now because I've switched back to my original bridge. There are slight marks on the saddle string grooves where the strings rested, but overall, there are no noticeable scratches or dullness, and I think it's in good condition, subjectively speaking. String spacing is 19mm. Installation uses four screws, but you can install it without modification because the screw hole spacing is the same as a standard Fender-type saddle, just without using the middle hole of the five. The bridge plate is steel, and the saddles are machined brass. The low end is significantly enhanced, and the sound becomes tighter. I removed it because it felt a bit too hi-fi for my rough rock playing, but I think it's a very good bridge. Please refrain from price negotiations. Thank you very much.