These paper labels are the perfect size for printing labels that need to subsequently removed such for glass panes, books, DVD cases and a variety of other home, office and warehouse high viability projects. 2-5/16" x 4" 300 Labels Per Roll Labels are blue for professional results. Labels are smudge-proof as well as water and oil resistant BPA Free All labels sold by HouseLabels for use in Dymo/CoStar LabelWriters are tested to ensure that these labels all fall within Dymo material specifications Compatible Dymo Printers: 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 International Warning North American LabelWriter printers require a perforation between labels to detect where the next label position is located. Non-North American LabelWriter printers require black bars printed on the backside of the label to detect the position of the next label. If your printer requires the black bars, then our labels will NOT work for you.