These bowls are finished with all-natural, non-toxic walnut oil. They are food safe, although they should be hand-washed, and over time, repeated washings will eventually require renewed applications of finish. Mineral oil or walnut oil can be easily reapplied, as with cutting boards Please check this page regularly to see what new bowls become available. And always feel free to contact me directly at [email protected] if you'd like to commission a bowl or set of bowls. Contingent on my available lumber, I can turn similar bowls out of walnut, sassafras, sweet gum, maple, cherry, white and red oak, and other woods.