Aluminium profiles are also characterised by the greatest stability among the materials used for windows. They are lightweight and durable, making them the best choice for the installation of large and heavy glazing. A typical frame can hold burglar-proof glass packages weighing as much as 50-60 kg/m2! In addition, aluminium is easily mouldable, allowing the creation of a variety of window shapes, such as rectangular, round or arched. Thanks to its high stability and strength, the profile can be relatively narrow, allowing for large glazings with almost no visible frame.