Hellermann Tyton WM-4Y-25 Yellow ShrinkTrak Shrink Tag Wire Markers, 1/2" Min (Pack of 25) Flexible, flame retardant, heat shrinkable polyolefin tubing meets all military specifications Standard colors - yellow, white and black 3:1 shrink ratio Non-slip, printable liner allows additional marker data to be printed on the reverse side for records and placement instructions Markers dispense directly into HellermannTyton thermal transfer printers with custom box opening