Looking online I see "cable labels" in various sizes on Amazon, ... (but finding a nice variety of colors in the "paper" labels) Testing it out in software, Looks like a .5x2 inch might work.

I may just go with the Cable Tie Marker Label route.... I never used a Brady but have heard high praises. With our various brothers, using the flexiable ...

Next is a 4-foot $69.99 Monster 700 model cable, with a label stating 60/120Hz, followed by a model 900, labeled for 120Hz and 3-D, for $79.99. The Monster 1000 model boasts a 240Hz-480Hz and 3-D ...

HDMI Licensing has also created a mobile app that enables buyers to scan the label of HDMI cables to determine if they are Premium HDMI certified. Everything you ever needed to know about HDMI 2.0; ...