I use Brother TZ Tape for their P-touch labelers. They now have a Flexible ID Tape which is designed for cables and other objects with sharp bends. It comes in 1/2", 3/4", 1", and 1 1/2" widths, although the 1/2" is the most popular at retail stores (i.e. Staples), the other widths you would probably have to order through www.brother.com. At this point Brother only offers this tape in white with black ink.

Blessings, and here's to readable labels on cables