These have been around for a while but I believe they have gone through some improvements in recent times. To be clear what they are, they look like this:
All metal internals and a bottom coil you can just see poking out. They have a capacity of 1.5 ml, within a gnat’s whisker.
I received my first ones here...
All metal internals and a bottom coil you can just see poking out. They have a capacity of 1.5 ml, within a gnat’s whisker.
I received my first ones here...

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