Surface: Natural-oiled - suitable for underfloor heating systems Product description: A surface full of natural character; contrasting colour variations are a valued feature. Occasional knotholes are professionally filled. Occasional seasoning shakes are allowed. The thermo-treatment affects the entire depth of the wear layer. The brown colour will not fade away like a surface stain. MANOR HOUSE FLOOR BOARDS: Planks in four different widths can be installed in one room! Only available in random widths. Availability upon request!