Glass Mirror Strips are made from plate glass about 2mm thick, with a highly silvered back. Acrylic Mirror Strips are about 3mm thick. Additional Info: Glass mirror strips are made from plate glass about 2mm thick, with a highly silvered back. Acrylic mirror strips are about 3mm thick. Package Size(L x W x H): 4.5 X 4.5 X 2 (IN) Categories: Optics, Mirrors HTS Code: 9001.90.6000 UNSPSC: 3.12417e+007 Country Of Origin: INDIA