Simple Care and Maintenance is essential to preserving and prolonging the life of John Boos Cutting Boards and Butcher Blocks, or any unsealed, naural wood item in your kitchen. This set includes one bottle of 16 ounce Mystery Oil and One Round Applicator.Boos Block Mystery Oil should be applied regularly, to penetrate deep into the grain of the wood surface to protect and revitalize the wood fibers. Mystery Oil is Made in the USA from all natural ingredients and is food safe (NSF certified). The Boos Block applicator provides a fast, professional and easy way to apply Mystery Oil and John Boos board cream (sold separately) to your cutting boards, butcher blocks, wooden bowls and utensils. The solid beech wood handle on the applicator provides a perfect grip for ease of control. The applicator includes a cap for easy storage and protection.Instructions:1.A minimum of once a month (depending upon the use and household conditions), apply an even coat of Boos Mystery oil to all surfaces of your wood cutting board using the Boos block applicator.2. Allow the Mystery oil to fully penetrate through the wood fibers overnight, then wipe off any excess oil.3. Apply additional oil to any visible dry spots or for any other necessary reasons. Do not over oil your cutting board.4. For additional protection, it is recommended to use Boos Block Board Cream (sold separately on Amazon) to seal the top of the wood surface. Apply an even coat of the board cream using the Boos block applicator. Allow the board cream to penetrate the wood surface overnight, then wipe off any excess cream.