The perfect place to store thread! I bought two of these to use on my 5000m spools of embroidery thread. You are wonderful! The assembly took a while, that's the only thing that's a bit annoying about these coasters. Assembled, they can simply be hung on the wall. I put them in studs because the weight of the filament can get heavy with large spools. Since I use them for large spools, I put the spindles in every other slot that's perfect for them. I would definitely buy again. I love that these coasters keep my floss neat and organized and out of reach of my little kids who for some reason just love to play with floss ;)