Read
here.
These were exclusively used based on Primal's post except for the short silicone run.
Now look at the specs on those butyl rubber stoppers. No paperwork or origin info as far as I can see. Compare to the class 6 stoppers I linked to.
I am going to put myself in Primal's shoes on this one. I would be pissed. Goes to show how important stopper formulation and specs are on injection vial stoppers. Fortunately there are very good and extremely cheap alternatives. And I appreciate
@Primal_Pharma switching on new vials as soon as possible.
As far as product already out there, you know the drill. Serious risk of stopper falling apart and into your anabolic go-go juice every time you draw. Not even going down the leaching rabbit hole when you invert the vial.