M21-500-461 Continuous Label Roll Cartridge, Label Color White, Label Finish Gloss, Label Material Polyester, Label Width 1/2 in, Material Properties Autoclavable, Cryogenic, Halogen Free, Ribbon Color Black, Roll Length 21 ft, Vial/Tube Size 1.5 ml, For Print Method Thermal Transfer, Maximum Service Temperature 230 Degrees F