Bought these to replace the saddles that came with an old second hand Washburn/Disney Hannah Montanna guitar as the originals were rusted and gunky! Was a little worried if the intonation screw threads would be long enough as the originals had extra long screws which were almost maxed out on the top three string, but I put on 10s strings rather than the 9s that were originally on it and that meant the saddles needed to be a little further back to get the correct intonation so all was good. These fitted into Hannah's tray perfectly and were easily adjusted to get the action to the right height. I don't know if the brass adds to the sustain or tone but they certainly look good and feel very solid! Very pleased with them. Hannah also had some new tuners and now she plays great!