This is a beautifully shaped Black Acacia bowl. It was made from a Redwood City, California tree felled in 2006. A walnut oil finish was used to help protect the wood's character. The bowl may be cleaned with warm water and mild detergent. Wipe dry immediately. It can be re-oiled with walnut oil (found in grocery stores) or mineral oil. Do not use vegetable oils as they turn rancid in time.