The materials are good and it would be a great product but the actual part of the jack is a bit too long and the bars on some of them are not straight. In order for them to work, you must rotate them while using them until the sound is clear. I will say after about a week of use everything seemed to straighten out and adjust so you don't have to fix it that often. But even after that, they don't work exactly the way you want them to. They generally work if you're okay with something that you need to tweak from time to time. The biggest plus is that they are very easy to solder.
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