The design of the door leaf interior door 1U king. Increased strength of interior doors Raddoors is provided by the scheme of their Assembly. Drill elements (bearing rods) are made of "sandwich plate" LVL (MDF + glued coniferous array) for maximum rigidity. Exterior finish-polypropylene 3D coating, which naturally imitates the natural wood texture, is 100% environmentally friendly. This coating (also called 3D ekoshpon) does not fade under the influence of sunlight and is resistant to various types of exposure (chemical or mechanical), and does not require additional care for it.