Accessories
Number Labels
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Slide-on numbers that show your units on every pen. Choose Preset Doses — 16 numbers from 5 to 80 in steps of 5 — or Build Your Own: 20 digits, one above and one below your peptide label, for any number from 0 to 99.
How to use — Preset Doses
Slide the number onto your pen.
Slide your peptide label on over it.
Your units show on the front, the peptide name on the back.
How to use — Build Your Own
Slide a digit on above the label.
Slide your peptide label on — make sure the top number sits in the label's gap.
Slide the second number on below.
Peptide name is still on the back.
Your units, on the pen
When you run more than one pen, the number tells you how many units you dial on each one — no notes, no guessing. Pair it with a RefillPen Label for the peptide name, and keep spare labels on a Label Stand.
Invented and proudly introduced by RefillPen in October of 2026. © 2026 RefillPen LLC — Number Labels design. All rights reserved.
Common questions
Which set should I choose?
Preset Doses if your units are a multiple of 5 (5 to 80) — one number per pen. Build Your Own if you need any other number from 0 to 99, made from two digits.
What do the numbers mean?
Each number is the units you dial on that pen, so you can see it at a glance. 1 click on a RefillPen is 1 unit.
How do they go on?
Slide the number onto the pen first, then slide your peptide label on over it. For Build Your Own, the top digit sits in the label's gap and the second digit slides on below. The numbers face the front and the peptide name still shows on the back.
What's in each set?
Preset Doses: 16 numbers — 5, 10, 15 … 80. Build Your Own: 20 digits — 0 to 9 that slide on above the label and 0 to 9 that slide on below it. All pieces come in the color you choose.
Can I buy single numbers or digits?
Not yet — the numbers come as a full set.
Complete your setup
Want the whole setup? Build a Starter Kit →
Label Stand
Keeps your labels stacked, upright and easy to grab.
Color: Black
3ml Individually Packed Glass Cartridge For Pen
The $1 sterilized 3 mL glass refill that fits every RefillPen.
Halo Cartridge Holder
A filling block that holds your cartridge steady for a clean, bubble-free fill.
Color: Black
RefillPen Labels
Slide-on labels so you can tell at a glance what's loaded in each pen.