Avery 900391A Direct Thermal Labels: Avery 900391A 30 Rolls of 2 X 2 Inch Direct Thermal Label. The Avery 900391A thermal labels are specially designed to work with the Avery Monarch Pathfinder 6032, 6039, Pathfinder Ultra 6057 Printer. 300 Labels per roll with 9,000 labels per case. Core size is 1" with a diameter of 2.5".