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I usually order my insulin pens from amazon and would get 4mm thinking 8mm would hurt more due to the needle being longer, not to mention the needle pens weren’t the best quality! UNTIL.. I have come upon these needles! 10/10 quality and the size of the needle doesn’t hurt. I would highly recommend!
These needles have the same specs and look like the more costly "real ones," but they bendeasily and have poor insulin flow. I had several "bad shots," which I newer had with other needle, particularly problemmatic where you don't know if you have gottrn a full dose.