Thermal Transfer Labels - 4" x 6" - Fluorescent Green - 3" Core A Thermal Transfer Ribbon is REQUIRED for Printing If you are not using a printer, you can use any regular marker or pen on these labels. The ink will dry in seconds and won't smudge. Size: 4 x 6 inches Inner Core Size: 3 Inches | Outer Roll Diameter: 8 Inches Labels per Roll: 1,000