6 Rolls; 100 Labels per Roll of DYMO-Compatible 30387 3-Part Internet Postage Labels (2-5/16" x 10-1/2") Buy this genuine HouseLabels' product with confidence -- a 100% guarantee of satisfaction is provided. This product is genuine ONLY if the HouseLabels' logo is behind the release liner of each label AND each roll is packed in an individual mini-carton, with the HouseLabels' logo, to protect each roll from sunlight and scuffing. Each white label is blank and ready for your printing. 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 This label is required for printing concatenated barcode labels for commercial pricing from Endicia/DAZzle 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 LabelWriters: XL, XL+, BC, BC+, TURBO, SE200, SE250, ACII 200 / ASCII 250 All labels sold by HouseLabels for use in DYMO LabelWriters 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.