ALL OF OUR PRODUCTS ARE BPA FREEBPA (bisphenol A) is an industrial chemical that has been used since the 1960s. Certain thermal paper may contain BPA. The National Toxicology Program at the Department of Health and Human Services says it has some concern about the possible health effects of BPA on the brain, behavior and prostate gland of fetuses, infants and children.Shipping/Postage Labels4in x 6in | Rectangle | White | Direct Thermal | Permanent-Adhesive Labels are bright white for professional resultsLabels are smudge-proof as well as water and oil resistantAll labels sold by HouseLabels for use in Zebra/Eltron printers are tested to ensure that these labels all fall within Zebra/Eltron material specificationsPrint labels using shipping programs of Endicia.com, Stamps.comor PayPalCompatible Zebra/Eltron Printers:LP-2844, 2742, 2442, 2443, 2642 , 2622, 2543, 3742 and 3642 UPC CODE: 6-08866-95073-8