John Boos Block MYS-3 Mystery Butcher Block Oil, 16 Ounce Bottles, 3 Pack This set contains three (3) 16 ounce/473mL of John Boos Mystery Oil, ideal for maintaining and preserving wood food preparation surfaces including: cutting boards, butcher blocks, countertops and utensils Proudly Made in the USA from all natural materials Once a month, John Boos Mystery Oil to your cutting board or butcher block and allow it to soak in overnight. Repeat the process more often when your board is new, or if you live in a dry/arid climate Regular oiling can prevent wood from drying, splitting and cracking NSF Certified (National Sanitation Foundation), and safe for use on food preparation surfaces