These are 2 new metal pickup escutcheons (for flat-top bodies). It is said that using metal escutcheons generally tightens the sound image. Many other listings offer 2mm thick items, which look good from the front but can appear to make the pickups protrude too much when viewed from the side. For models with tight pickup cavities, you may need to be careful about interference between the screws and the body, depending on the screw length used to secure the pickup. These items are 4mm thick, providing a good balance. The image shows an example of installation on a PRS SE CE, which has a tight pickup cavity. It fits without any modification. Please refer to the diagram in the image for detailed dimensions.