John Boos Mystery Oil is recommended for care of tops and blocks that are used as a working and cutting surface. This fine oil is a mixture of mineral oil, linseed oil and tung oil, giving your John Boos product the same like-new, quality finish every time. To protect and keep your fine butcher blocks and table tops looking new, John Boos Co. recommends regular oiling every 4-6 weeks. 16 fl.-Ounce bottle