Houselabels 2-5/16 x 10-1/2 Inches Dymo-Compatible 30387 3-Part Internet Postage Labels, 1 Roll, 100 Labels per Roll HouseLabel branded products are manufactured by HouseLabels and only sold by HouseLabels and Amazon Supplies. There may be other companies claiming to sell this product - they do not. HouseLabels stands behind their products with a 100% guarantee of satisfaction. When you look at reviews, please bear in mind that the review may be of a product (possibly an inferior product) manufactured by one of these companies and not a HouseLabel"s product 2-5/16" x 10-1/2", Rectangle, White, Direct Thermal, BPA Free, Permanent-Adhesive, 100 Labels per Roll These internet postage with delivery confirmation labels are 3-part internet postage labels The label has a large destination and return address part, a postage part, and a special part for the electronic delivery confirmation barcode. Fluorescent ink compliant with USPS regulations DYMO Printers: 300, 310, 315, 320, 330, 400, 400 Duo, 400 Twin Turbo, 450, 450 Duo, 450 Turbo, 450 Twin Turbo, 4XL, EL40, EL60, SE300, SE450. CoStar Label Writers: XL, XL+, BC, BC+, TURBO, SE200, SE250, ACII 200 / ASCII 250 All labels sold by HouseLabels for use in DYMO Label Writers are tested to ensure that they fall within DYMO specifications. Labels are smooth and bright white for professional results. Labels are smudge-proof as well as water and oil resistant. All temperature, strong permanent adhesive is excellent for all general purpose labeling applications Each roll is individually packed into a protective black polybag and then placed in a mini-carton to protect it from dirt, sunlight and scuffing