the sssnake Cable Label Holder Set Large

Great holders and price is good too. You can get the same from Ali for the similar price, but Thomann adds good paper labels. Bought several of these small and big ones - small is fine to mark only one cable, big is fine to tie both cables and mark them together. Instead of white paper I just used cheep colored paper from euroshop to mark cables (with some bright colors), so they are better visible during the day and evening.

You only get 10 in the packet but my main concern is the little loops the zip-tie goes through seem a little fragile and I can see them getting broken quite easily. But, plenty of uses for these gizmos, not just for cables!

The tag clip is brittle and a little hard to re-open once you close it, that's the only negative i could think of.