B121 Midrange Wax / Resin Type B121 is the latest wax/resin ribbon available from ITW Thermal Films (Europe and Asia only). It is designed to give outstanding print density on the widest range of label materials at high speed while using minimal printhead energy. Specifically designed for flathead thermal transfer printers - B121 is a ribbon that breaks new ground. Its unique back coat results in a formulation at the cutting edge of thermal ribbon technology. High sensitivity helps printheads stay cool, while class-leading resistance to burning and snapping keep the line running when things do get a little hotter. Outstanding print quality at the highest speeds and on the widest range of label substrates imaginable makes B121 the easiest route to hassle free labeling.