Eterna Engineered Oak AB Grade is a 600 x 125 x 14/3mm engineered oak herringbone with a 3mm wear layer and a tongue-and-groove profile. Each board is light wirebrushed and protected by 9-11 layers of UV lacquer, and is supplied in AB prime grade. Boxes cover 1.5 square metres. Six colours are available, from Pearl White Oak through to Smoked Oak.