[ Specifications]: 4 in x 4 in (102 mm x 102 mm) (350 Labels/Roll, 6 Rolls)，Paper tube diameter：1"(25.4mm). No Ink Toner or Ribbons Needed! [ Compability ]: Suitable for Zebra, Rollo, Eltron, Intermec, Datamax, Fargo, Sato, NEX and most of the thermal label printers that the print width can be adjusted to 4 inches. [Warm Tips]: DO NOT SUPPORT DYMO & Brother Label Printer. [ Perforated ]: We go above and beyond the standard labels sold online. Our premium labels are perforated to allow easier separation between labels. Fold the printed labels together with the perforation to keep them organized. [ Adhesive ]: Still reliable on extreme temperature (14℉~158℉). The patented Adhesive provides long-lasting powerful stickness. No more shipping lost caused by labels peel-off. [ Fade & Smear Resistant ]: Prints crystal clear image and easy-to-read barcodes. Avoid fade and smear. Let your carriers easily scan barcode until delivery. [ Technical Support ]: We stand behind our brand. BETCKEY offers lifetime free customer support via Amazon message email phone call and remote deskoperation. Contact us immediately if you need any assistance. BETCKEY - 4" x 4" (102 mm x 102 mm) Shipping & Large Square Labels Compatible with Zebra & Rollo Label Printer,Premium Adhesive & Perforated [6 Rolls, 2100 Labels]