Yesterday I went to a small Yard Sale in the garden of Haddenham's Abbeyfield Residential Home. I saw this and knew how useful they are, especially in holding steady a large piece of material when it's draped on your cutting table! It's about 3" tall, of clear plastic (I suppose) and has these transparent bubbles in clear and also in amethyst. I didn't need it but couldn't resist it. I also bought a few Country Living mags which I've found useful in the past as a source of advertising photos to paint in 1 1/2 hours - if I ever get back to it.