The technology is available in Premium door group, which is a durable and everlasting solution. The basis for the design is a traditional muntin made of softwood. The strengthening and stabilizing filling is ensured thanks to a layer of so-called honeycomb. Whereas the outer layer, called the facing, is made of a wooden HDF board, 3 mm thick, finished with a selected decoration. Thanks to the application of a double muntin, a door on a wooden structure can be shortened by up to to 60 mm.