Sheet mirror glass is the type most widely used in our everyday life, in bathrooms, wardrobes or walls.
They are made of float glass, since this type yields a flat surface of the highest quality.
Source https: https://en.wikipedia.org/wiki/Glass
Available sizes and thicknesses in split size and sheet: 3210x2250mm (3, 4, 5 mm), 1605x2550mm (3,4 mm)