These are a silver plate base metal filigree.Size is 40mm Considerably thinner then many filigrees. Very light weight, which is not necessarily a bad thing when making jewelry. They are thin enough to be bent easily. Lends them well to being glued to barrette backs and things like that where perhaps you want to have them conform to some shape. The cameo shown is just to help you with size. That is a 30x22mm cameo.You are buying the filigree