This product utilizes heat-sensitive coating that darkens when it is exposed to heat. Designed to work efficiently in your thermal print machine. These printing paper rolls provide high quality output with crisp black printing. Best suited for receipts, shipping labels and barcode labels. Work great in offices, schools, factories and at home.This product utilizes heat-sensitive coating that darkens when it is exposed to heat. Designed to work efficiently in your thermal print machine. These printing paper rolls provide high quality output with crisp black printing. Best suited for receipts, shipping labels and barcode labels. Work great in offices, schools, factories and at home.