According to the labels... -[ HMM ]-

Label printer cartridges for labels in the signature colors of the Christmas holiday season. (These cartridges produce their respective colors on a clear base, visible when the backing is peeled off. )

 

Even though the color combination has such a strong seasonal association, I use these tapes to label white 16mm leaders, using the same green-head and red-tail standard as I would with colored leader.

Done