Oak Natur Brushed Natural-oiled Character: Course texture and prominent grain having rather dynamic colors but without harsh color variations, with medullary rays. Only minor flame pattern is permitted. Knot: Well intergrown knots, up to a diameter of 3 mm, are permitted, except for those in groups. Dark knot is permitted, up to a diameter of 1 mm Sapwood: Not permitted
According to the EN 13489 standard, 3 % of different grade than indicated is acceptable.