Box of ten #44 EIKO brand bulbs, 6.3V, 0.25A, 0.90MCSD (candlepower), 3,000 hours, miniature bayonet BA9.
These bulbs run hotter and slightly brighter than the #47s, and work really nicely for lighting up playfield inserts - those plastic circles and triangles (etc.) - that light up to show you features (5000 POINTS, 2X BONUS, etc.).
It is a GOOD idea to replace all the #44 bulbs from behind the backglass and under the playfield plastics (the artwork plastics) with #47 bulbs to reduce the risk of damage to them and so the game runs cooler and circuits will last longer.