Replacement caps for our 5 ml and 10 ml bottles.  These are steel rollerballs with a taller cap to fit over the roller.

We ship these un-installed but they pop in fairly easy.

Rollerballs are generally fine for light travel or tucking in a bag, but they are not advised for situations where the air pressure might change like an airplane ride, mountain road trip or long distance shipping.  In those situations we recommend a standard cap.

Search: Roller ball or rollerball caps.