When you need high quality thermal paper, get our 4" premium heavy thermal paper. Compatible with most Zebra QLn420 & Zebra ZQ520 printer models (and other Zebra models as well) and comes in a case of 36 rolls. Great for mobile printing applications such as delivery, warehousing, receipts and more. The long-lasting print stands up under fluorescent bulbs and UV exposure. 4" (102mm) Premium Heavy Thermal Paper - Zebra (36 rolls/case) Width: 4" (102mm) Core Size: 3/4" Solid Core Roll Diameter: 2 1/4" Packaging: 36 Rolls per Case Paper Type: Premium Heavy Thermal Paper (78gsm - 80 gsm) This Heavy Thermal Paper fits: Zebra P4T, Zebra QL 420, Zebra QL 420 Plus, Zebra RW 420, Zebra ZQ520, Zebra ZQ500 series Zebra compatible part # LD-R4KN5B And many more!