Extend the life of your wooden cutting board with Boos Block Mystery Oil, a cutting board oil. We recommend that you oil the cutting board every 3-4 weeks. Apply oil liberally and leave it on overnight. Add more oil in the morning if there are dry patches. Feel free to combine with Boos Block Board Cream, start with Mystery Oil and finish with a layer of Board Cream. The oil is food approved and consists of mineral oil, linseed oil and orange oil. Volume 473 ml.