JOHN BOOS 1-1/2" Thick Butcher Block Maple Tops feature a penetrating oil finish that seals out liquids. A special combination of pure mineral oil, raw linseed oil and melted paraffin comprises the sealed surface. Periodic applications of NSF-approved oil (sold separately) will help preserve top’s original composition. Includes the same strong characteristics as our other maple tops. Can be sanded down many times to reveal smooth working surface. Made in USA.