PLEASE NOTE: Mirror Ceiling Tiles are made of High Impact Polystyrene (HIPS). We stock 1mm thick mirror ceiling tiles that have been designed to have any generic ceiling tile installed on top to provide rigidity. However, many of our customers find that mirror tiles are rigid enough without re-enforcement. The tiles can be cut with regular utility knife by scoring on the face side and snapping. Additionally we offer 2mm ceiling tiles that do not require additional tile on top, but have a minimum order of 1024 sf.