Epicurean Kitchen Series Cutting Surfaces are made from 1/4 - inch Richlite, an environmentally-friendly, natural wood fiber composite laminate that's non porous to prohibit bacteria. Approved by the NSF (National Sanitary Foundation), durable Richlite has been demanded by chefs in restaurants and commercial kitchens worldwide for over 40 years. Richlite won't dull knives, is dishwasher safe and temperature resistant up to 350°F. It's ideal for food preparation and serving, and develops a richer color over time.