Have been buying these for a long time now, only now got to write a review. This is a sturdy jack, one that is not going to deteriorate quickly. The black casing is made out of plastic, but mind you it is very sturdy and tough. I have a guitar cable with two of these jacks that has been thrown around for the last four years on and off stage, and they work perfectly.
Very reliable and a great option for anyone who doesn't want to shell out big buck for something simple and small.
Neutrik quality, easy soldering, toughly built. Would recommend.