Nautral gift of the wood material ,each one have own unique grain ,handmade craft shape . We advise handwash only ,Simply wash the bowl with warm and mild soapy water, using a soft sponge, and air dry naturally. Avoid microwave use, dishwashers . direct sunlight in order to prevent deformation and discolouration. Please store in a well-ventilated place. Treat with mineral oil occasionally to restore the grain to its natural beauty.