100% natural. Non GMO Project verified. nongmoproject.org. Non BPA liner. Steel - Please recycle when empty. Questions, call 1-800-858-6372. FlashSteam Difference: At Hunt's we say no to chemicals like lye (Lye peeling is generally recognized as safe by the FDA and has no adverse effects on the healthfulness of tomatoes). Instead, we peel our tomatoes with FlashSteam, from simple hot water. This allows us to get more out of every tomato for our paste which means less waste in landfills and no chemical by-products go back into the earth. We just think it's the right thing to do. All natural. Non BPA liner. Non GMO. No artificial ingredients or preservatives. It's good to be different. Recipes at Hunts.com. Food you love.