Mercier 6.5" Origins Engineered Authentic American Walnut Matte 19mm Hardwood PlankThe Mercier Origins Engineered 6. 5" Authentic American Walnut Matte 19mm plank provides dramatic walnut character with an extra wide profile. At 6. 5 inches wide and 85 inches long, it brings a bold yet elegant look to larger rooms. The matte finish softens the rich tones, while the thick 19mm engineered structure ensures strength over time. Ideal for luxury spaces, this floor is part of Merciers sustainably crafted Origins collection.