Black Gray Silver Off Set Glass Mosaic Tile Color: Black, dark gray, and silver Each tile measures .875" x 1.875" x .187" (4.8 mm) thick; total 72 tiles per 12.625" x 11.75" (1 sq. ft.) sheet. Back mounted on mesh with a joint of 2 mm, easier to be installed than paper-mount Cost: The price is per sheet; Sheet Size: 12-5/8" x 12-5/8" (1.11 sqft)