I'm selling these Mapleshade speaker plinths for my friend's family due to his passing. These are custom dimension plinths. They are 12" wide x 19" deep x 4" thick. They have scratches, so please refer to the photos. I use Mapleshade speaker plinths as well and they really do make a difference. They reduce vibrations so there is less distortion in the sound. If you go to Mapleshade's site there are testimonials. These plinths would also work great with amplifiers. I will pay for shipping if asking price is met. I'd be happy to answer any questions.