Probably a dumb question but here it goes - Pep Pen Quality
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I wanted to know if there is a real difference between various V2 peptide pins In terms of build quality. I mainly buy them here but I have purchased a few other on the open market mainly as an experiment. But I had a pen cartridge holder fail on me today. The plastic housing came away from the silver ring that attaches to the pen plunger part. I think the housing on my Gansolin pen may be metal but I am wondering if there are any peptide pen brands that use a glass cartridge holder, instead of the plastic.
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