@daryljanmaat
Hello and welcome!
Its a implantable Magnet.
There is nearly 0 reason to implant it in the finger, Its just too big for a finger.
Its a magnet in a glass tube, 15x3mm
Here you can get some info about the magnet it self
Here you can get info about the X series Implants in general
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highly recommend that!
There are lots of good info about the X Series!