Made of solid walnut. Dave Marcoullier is a certified arborist and landscape designer living in San Francisco's Mission District, and much of his work is an extension of these two disciplines. His work is comprised of CNC routed solid hardwood wall hangings and cheese boards. He derives color variations and contrast by treating some areas with natural oil, while leaving other areas of wood untouched. This piece would be perfect for a doctors office or as a gift to a med student.