Coral OAK Vulcano black Oak wood with consistent colouring resulting from special heat treatment (without chemical additives). Oak plank in3-layer construction with small bevel on long side and approx. 4 mm top layer, with approx. 4 mm backing in the same wood and middle layer conifer. Tongue and groove on all sides for easy installation. Variations in colour and sapwood at the edges possible. Small open cracks and unsealed spots of a few millimetres are permitted. Cracks, knotholes and large knots are emphasized with putty.