Coaster Set - Circle of Fifths Design

I bought these because I thought they'd be fun coasters, to help my children learn their key signatures better, but they are very thin, flexible, and with rubbery bottoms, so that wasn't quite what I wanted to have in my living room. They are thin enough
that each child is able to keep one in his music folder. I wouldn't pay this much for them, again. I'm a former professional oboist-turned-mama. Still, the children loved them. :)