US Rainbow Dust Double Sided Edible Pen Full Set
.5 mm side and 2.5mm side
These have the smallest tip that I have been able to find on an edible pen. I love that it writes like a pen or pencil, creating perfect lines for fine details. You also have the thicker end to add to its versatility. I did have one pen arrived that had leaked (I've ordered two sets so far), and it was quickly replaced.