Solid brass | hand crafted | italian carrara marble Introducing the geo coaster holders sold in set of 4, complete with marble inserts. We decided to add a little class and sophistication to the way your coasters look by combining our favourite materials...marble and metal. Each stone coaster is simply placed within the holder to create the ultimate luxe look. The stone piece is loose, and can be lifted out from the holder if need be, or you can place a bead of silicon or superglue to permanently hold the stone in place. Product info: Frame: solid brass Marble: honed italian carrara 10cm dia 1cmh (approx) Solid brass is a material that contains raw metals such as copper & zinc which overtime can patina when exposed to heat & moisture.