Precut Label Roll, For Print Method Thermal-Transfer, Compatible Grainger Part Number 21U478, Compatible Mfr Part Number B30-R6400, Label Color White, Label Finish Matte, Label Height 1/2 in, Label Material Polyester, Label Width 3/8 in, Labels per Roll 1,500, Printer Series Compatibility BBP33, i3300, Vial/Tube Size 2.0 mL, Adhesive Properties Permanent Adhesive, Material Series B-492, Recommended Ribbon B30-R6400, Resistance Properties Chemical-Resistant, Smear-Resistant