This is called 'piggy-back' shelving which is designed for 12" LPs, I had the cardboard trays made to fit the 45's. I also had some wooden boxes made which 'sit inside' for my 78's. You used to get this shelving from Heals/ Habitat, not sure if it's still available online, it just comes in single units and you can build as high and as long as you want. It's really good and easy to move from house to house should you ever move again. Oh, and that's my speakers.......