4"x6" fanfold direct thermal shipping labels. Standard size for UPS, Fedex, USPS, and more. Compatible with all brands of thermal printer such as Zebra, Rollo, Eltron, iPDRT, MUNBYN, Fargo, Datamax, Sato, Intermec, NEX, and others. These labels are not compatible with Dymo, or others printers that require a black bar on the label liner for printers to read. Free shipping. Ships from USA. We ship 5 days a week, and most Saturdays too! Domestic (within the USA) orders of fewer than 500 labels are shipped using USPS First-Class Mail. Orders are shipped on the same or next business day from when they are placed. These labels are UPS brand. The backing paper says UPS, but the labels themselves are plain white. We ship most Saturdays too! Your order will be marked as shipped as soon as postage is printed. First-Class mail does not always include a tracking number. Shipping Label Specifications: 4x6 inches, = 500 labels. Eco-Friendly Shipping Labels: 4x6 shipping label rolls are FSC RoHS approved paper and are BPS free. Reliable Shipping Label Quality: shipping labels use a premium and strong adhesive that allows each label to stick tightly to any packaging surface for a long time. 4x6 shipping label rolls are not fade resistant, water, oil and scratch resistant.