u/Hankitsune

When looking for tiny colon neon bulbs a few years ago I found these 3mm bulbs. They're incredibly tiny and ideal for use with IN-2, IN-16, IN-17 tubes. The picture shows an IN-17 tube, a common 5mm (5x13) bulb and the 3mm (3x10) bulb. It's amazing the can produce them this small.

Should you ever need them, search for 3mm neon bulb on eBay or Ali.