M110 Label Printer Label, White Square Self-Adhesive Thermal Paper, Direct Thermal Paper Compatible for M110 Label Printer, Black on White, 1.18" x 0.79" (30x20mm), 320 Labels/Roll : Amazon.ca: Office Products
Compatible Dymo 30332 White Square Labels 1'' x 1'' (1 x 750 labels)
Connect Recommended Hardware to Square Stand | Square Support Center - US