In order to be able to comfortably mount the new speakers in the car, you will usually need the appropriate reduction rings under the speakers for installation. The pads can be plastic or pressed wood, so-called MDF. We mostly use MDF pads, which are strong and great to work with. In addition, you can (if necessary) partially edit (crop) them. Compared to MDF pads, plastic pads have the advantage of an unlimited lifespan.