John Boos Mystery Oil Is Recommended For Care Of Tops & Blocks That Are Used As A Working, Cutting Surface. This Fine Oil Is A Mixture Of White Mineral Oil & Beeswax, & Will Give Your John Boos Product The Same Quality Finish As The Factory. We Recommend Oiling Your Tops Or Blocks Every 4-6 Weeks. This Food-Safe Oil Finish Keeps Your Blocks Looking New.