Ash Black Emerald flooring from Coswick Signature Ash collection is prefinished with CosNanoTech+ matte finishing technology that provides exceptional protection for your hardwood floors. CosNanoTech+ matte finish is composed of 12 coats of top quality sealers and compounds with aluminum oxide for extra durability. Matte surface sheen helps disguise dust, small scratches and other signs of wear and tear that acculumate over time. Coswick CosNanoTech+ finish comes with 25 year residential warranty. Ash Black Emerald flooring is available as solid, 2 layer T&G engineered, as well as 3-layer click CosLoc 5G engineered flooring.