Labels are bright white for professional results. Labels are smudge-proof as well as water and oil resistant. All labels sold by HouseLabels, for use in DYMO/CoStar LabelWriters, are tested to ensure that these labels all fall within DYMO material specifications. Print labels using shipping programs of Endicia.com, Stamps.com, PayPal, or eBay. Compatible DYMO Printers: DYMO LabelWriter 300, 310, 315, 320, EL40, EL60, SE300, 330, Turbo 400, 400 Turbo, Twin Turbo, DUO, 450, 450 Turbo, 450 Twin Turbo and 450 DUO. Also CoStar LabelWriter XL, XL+, BC, BC+, SE Series, ASCII Series.