Thermal roll paper 80x80 is ideal for thermal receipt printer. This roll paper use for standard receipt printer either cash register like for Postronix TX-88, Epson TM-T88IV, Star TSP143, and Bixolon SRP-350. 80x50 means the width of paper is about 80mm and the outter diameters is about 80mm including inner or the core. Please be mentions for choosing the paper. The long life printing result and the blacknest (dark) is depend on paper quality.

You may consider using thermal paper 80x50. Since price is very different for 80x50 and 80x80. Thermal paper 80x50 comes with cheaper price and 100% same of quality with 80x80.