Ultra

Ultra is a size class that has existed since Beast Wars. Ultra toys were sold in boxes and their prices was around $20. This continued to Robots in Disguise. In Armada, the $20 pricepoint was renamed Maxcon. "Ultra" was used again in Energon, but to indicate a $25 pricepoint that was introduced in Armada as Gigacon. This is the current naming.

From Teletraan I: The Transformers Wiki, a Wikia wiki.