Last updated 17/09/2026
Pen guide
what you received
Select the pen or pens in your order. These are 60-unit pens — 1 unit is 0.01 ml (100 units per ml). The cartridge holds up to 3 ml.
- 10mg1 ml fill
- 20mg2 ml fill
- 30mg+3 ml fill
Your pens
Tap every compound you received.
Select a pen above to see fill volume, units, and the amount table.
Full pen
Pre-filled, and the reusable device is included. This is the starter if you do not already have a Velocity Labs device.
Empty device
The reusable pen plus 2 cartridges, under Supplies. Fit a filled cartridge when you already have the compound.
How to use the device
- Attach a new sterile needle until it is tight. Keep the outer cap on until you are ready.
- Prime 1–2 units into a wipe the first time you use a new cartridge, so the fill reaches the needle.
- Dial the research volume from the table. One click is one unit. The dial goes to 60.
- Hold the button in until the dial returns to 0, then count to 6 before removing the needle.
- Unscrew the needle into a sharps bin. Recap the pen and put it back in the fridge.
Tips
- Do not add BAC water. Pens arrive already reconstituted.
- Write the compound and size on the device if you have more than one.
- Keep unused pens cool, dry, and away from light. Do not freeze a filled cartridge.
- If the dial will not turn, you are at the end of the cartridge.
Filled to order
We make each pen after your payment clears, and before we dispatch. They are not stored pre-filled. Needles, wipes, and extra BAC water are separate shop items unless they were on the same order.
Order again or ask us
Refills and the empty device are in the shop. If a parcel arrives damaged, message us with photos.