This listing is your choice of A4 297mm x 210mm or A3 420mm x 297mm size sheets of 3mm thick silver mirror acrylic sheets. For advice on any of our products, please contact our customer service using the eBay messaging system. Extruded silver mirror acrylic which is a crystal clear sheet with a highly reflective applied backing with a tough grey backing (the best there is). Excellent alternative to glass mirror as this material is tougher and a lot safer quoted as being 10 times stronger than glass. Manufactured using 3mm thick. This is not as rigid as glass and is flexible so if you intend to fix it to a wall please ensure the surface is flat or apply it to 3/4" ply to ensure it stays flat as it could distort. For cleaning just use warm water and a soft cloth no need for chemicals.