They could also be walnut. Buck gave me a beautiful huge walnut salad bowl for Mother's Day. It's gorgeous. Kitchenelf is spot on as far as caring for your bowl. My bowl is lightly finished, but I'd care for it similarly. Since Buck is a professional woodworker/furniture restorer, he is my first source of information.
"As a girl I had zero interest in the stove." - Julia Child
This is real inspiration. Look what Julia became!