Direct thermal printing, no need ribbon or ink . Use for Bar Code printer, not suitable for receipt printer. The printing words can keep 6 months. Size: #25mm 1000pcs/roll, fit for 2, 3 and 4 inch barcode printer. #30mm 700pcs/roll, fit for2, 3 and 4 inch barcode printer #35mm 550pcs/roll, fit for 2, 3, 4 inch barcode printer #40mm 800pcs/roll, fit for 2, 3, 4 inch barcode printer #45mm 650pcs/roll, fit for2, 3 and 4 inch barcode printer #50mm 550pcs/roll, fit for2, 3 and 4 inch barcode printer #50*30mm 700pcs/roll, fit for2, 3 and 4 inch barcode printer #55mm 450pcs/roll, fit for 3, 4 inch barcode printer #60mm 400Pcs/roll, fit for 3, 4 inch bar code printer #65mm 350pcs/roll, fit for 3, 4 inch bar code printer #70mm 300pcs/roll, fit for 3, 4 inch bar code printer #75mm 300pcs/roll, fit for 3, 4 inch bar code printer #80mm 350pcs/roll, fit for 4 inch bar code printer #Waterproof #thermal #sticker #Barcode #Label If you are not sure which size fit for your printer, you can send us message.