PMC STERLING is sterling silver in clay form. Cool Tools offers 25 gram and 50 gram packages of PMC STERLING - Sterling Silver Jewelry Clay to make anything you can imagine. PMC STERLING offers the strength of cast sterling with the freedom of designing in wax. Choose from 25 or 50 gram paks to fit your metal clay jewelry needs. PMC STERLING works just like other metal clays but is much stronger after firing. Start using PMC STERLING today available right here at Cool Tools.