The best known of these are Altbier from Dusseldorf and Kölsch from Cologne, which are lagered/stored in tanks for several weeks before being put on sale. Locals call them “obergäriges Lagerbier”, i.e. top-fermented lager beer. They are not as fruity as other ales, due to the lower fermentation temperature, so these beers are rather characterised by the malt and hops that are used. Of these two varieties, Kölsch is lighter and subtler, while Altbier is darker, maltier and more bitter. The alcohol content is usually 4.5% to 5.5%.