Through the 1990s, most computer cases had simple rectangular shapes, and were often painted beige or white with little attention given to the visual design. Beige box designs are still found on a large number of budget computers assembled from generic components. This class of machines is still known as white box computers. More modern computer cases include a much wider range of variation in shape, form factor, and materials, such as brushed aluminium and/or tempered glass which are offered with more expensive cases.