What it’s for
If your routine involves a pen instead of vials, this is the one consumable it eats.
What to check in the listing
BD Ultra-Fine (now sold under the name Embecta Micro-Fine — same needle, same factory) is the pen needle pharmacies hand out, and it is what we link where a store has it. 32G × 4 mm is the everyday choice; it fits every major pen. Universal-fit generics are fine as a backup, but the difference in sting between a BD tip and a cheap one is real.
At a glance
TypePen needle
Gauge32GGauge is the needle's thickness. A higher number is a thinner needle: 31G is thinner than 30G. Glossary Needle length4 mmNeedle length is how long the needle is. 4–8 mm (5/32–5/16 in) is common for under-the-skin use, and 13 mm (1/2 in) insulin syringes are used under the skin too; muscle needles are usually 25 mm (1 in) or longer. Glossary Needle connectionNo luer fitting (pen thread)Needle connection is how the needle attaches. Fixed means it is built in (least dead space). Luer-lock screws on and cannot pop off. Luer-slip pushes on. None means there is no luer fitting at all — a pen needle screws onto the pen's own thread. Glossary TipSharpTip is the shape of the needle's point. A blunt tip is far less likely to stick you while mixing and drawing up, but it is still a sharp that can go through skin under force. Never for injecting.
Used forPens, Under-the-skin injectionsUsed for lists the situations this product is for; the decision tool and the Finder match on these.
PriceBudgetPrice tier is the rough position within its category, not a live price: budget is the cheapest sensible option, premium costs more for a reason the page explains.
TravelCarry-on friendlyTravel says whether it is practical to fly with: carry-on means it goes through security without fuss.
SterileYesSterile means individually sealed and sterile until opened; anything that touches the inside of a vial or your skin should be.
Pack100Pack is how many come in the listing this site links to; it is shown only where every store's listing gives the same count. Check it against the listing, since photos often show ten and ship one.
ReusableNo
Specifications above were recorded from the Amazon listing on 2026-09-03. Listings change hands: open the listing for its current description, price and availability.
If the numbers in a syringe listing don't mean much yet, read Pens vs. vials and syringes: what supplies each one needs first.
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