This is a TOSHIBA TEC label product, part number LTX015015R1ST-01. It is a white, non-perforated, 1.5-inch circular label designed for thermal transfer printing.
Each roll contains 1,000 labels, and they are packaged 4 rolls per case. The labels have an inner diameter of 3 inches and an outer diameter of 5 inches, wound outward.
LTX015015R1ST-01 - Toshiba TEC, CONSUMABLES, LABEL, TT, NON-PERF, 1.5" CIRCLE, WHITE, 1, 000/ROLL, 4/CASE, 3" ID - 5" OD