Pen needle guides

Plain-English answers about pen needle sizes, injection comfort, travel, storage and which needles fit your pen.

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NovoFine 32G 4mm pen needles for an insulin pump backup kit
Pen Needles for Insulin Pump Backup: What to Keep in Your Pump Failure Kit

Insulin pumps can fail without warning. Here's why pump users keep pen needles in a backup kit, which needles fit common backup insulin pens, and how many to keep on hand.