Well this is just a plastic ring to put on your connectors! But is does make it a lot easier to identify your cables and connectors. You could use duck tape as an alternative, but this makes it a little bit more pro looking. If you suffer from OCD include these when you buy your connectors.
Fits the Neutrik connectors, and must be on the cable/connector BEFORE you solder. They can break if you tighten the connector to much.
I ordered an orange ring before to install it to my friend's cable and I really liked it. It looks good, it is an elegant way to identify which cable belongs to who. Also very handy when you have a bunch of cable and you want to know where is the end and the beginning of that cable. Well, after seeing my friend is so happy about it I decided to order a white and a red one! Easy to install, no more cable mis-identification I guess! :)