500 Labels per Stack, 1 Stack.Label size: 4 inch x 6 inch (100mm x 152mm) , with perforated line.Material: direct thermal labels, upgrade the label, the label backing paper is thicker and the printing is more smoothly.Strong adhesive to corrugated boxes and envelope.NOTE: Temperature and humidity should be paid attention to when storing thermal label paper.It is best to place it in a dry, dark, ventilated place free from chemical pollution.If the label paper is not used up, it is recommended to put it in a sealed bag or box as soon as possible.Compatible with Zebra, Roll, Fargo, Elton, Datamax, Sato, Intermec, NEX ,MUNBYN, MFlabel, Comer,Polono Labels, iDRPT, Jiose, K Comer, LabelRange, OFFNOVA, and other direct thermal printers without the hassle of sheets waste,or jams.(Labels are not compatible with Dymo printers, Brother printers, Laser/Inkjet/Copuer printers)Note: When you using labels, regardless of any printer, printers need to automatically identify labels before printing to avoid abnormal use of goods.(Printing Method: When you using labels, please let the labels side face up)