This sample pack contains our most used hood cleaning items for you to try out. 1 gallon each of Hood Cleaner, Smoke House, Mighty Max and Universal Foamer. The first two for you to see the difference between NaOH and KOH hood cleaners, the Mighty Max to clean aluminum filters and the outsides of stainless appliances and the Foamer to add body and hang time with foam to any of the products. These are gallons of the same products we carry separately in gallons and larger sizes so the products are concentrated and dilution ratios are the same if purchased individually. Case packs contain no more than 2 gallons of hazardous materials to be able to ship as Limited Quanitity. This pack of four is a at a slight discount then if purchased separately.