The Brady R6600 Series Resin Formulation offers excellent solvent and friction resistance when printed on the appropriate label material from Brady. Recommended for printing on heat shrinkable tubing materials from Brady, including material numbers B-342, B-7641, B-7642, B-7646 and B-7647. B30 Series "Drop & Click" print ribbons enable 5-second ribbon supply changes. No calibrating, no threading, no waste, no hassles and the ink always faces the right direction!