Swarovski Rhinestones or flat backs are multi faceted one side and flat on the other. The non-hotfix rhinestones we have available on this site have a silver foil backing which provides a better bonding surface than non foil rhinestones. Each flat back is made of cut glass leaded crystal and is extremely sparkly when in contact with any light. They are very popular for use on dance costumes, nail art and accessorising mobile phones and other personal appliances. Swarovski Non-hotfix flat back rhinestones can be attached to any non porous surface with gem-tac glue which is machine washable once dry. They are also sometimes referred to as flat back diamantes or diamontes