Bison 2′ x 2′ smooth 8 plank FSC® Cumaru wood tiles are commercial grade and constructed from responsibly harvested Forest Stewardship Council® certified hardwood to meet their high global standards for forest sustainability. FSC® certification assures wood products have positive environmental attributes, are backed by a global system of verification, and could contribute to LEED points and SITES criteria. Bison wood tiles weather over time, developing a silvery-gray patina. If maintaining the natural wood color is desired, wood tiles can be periodically cleaned and sealed.