MFLABEL 4 Rolls 4x6 Inches Direct Thermal Blank Shipping Labels 1,000 Labels per Roll (4,000 Labels) 100% compatible with Zebra/Eltron Direct Thermal Printers Label size: 4"x6"x1000, 3" core, with perforated line Strong adhesive to corrugated boxes and envelopes With premium raw material Minimum application temperature: 50; Service temperature range: -59~+149