Hardwood smoked. Not preserved. US Inspected and passed by Department of Agriculture. Fully cooked. No artificial ingredients. Minimally processed. No artificial preservatives. See nutrition fact panel for ingredients used to preserve quality. No by-products. No added MSG. No nitrates or nitrites added. Except these naturally occurring in celery juice and sea salt. Oscarmayer.com. Call us at: 1-800-222-2323.