The I4 Ionizer starfighter was a starfighter deployed by the Alliance during the Second War. The I4 Ionizer was produced by Koensayr Manufacturing, the famed producer of the Rebel Alliance's ubiquitous Y-wing starfighter. The I4's cockpit and main fuselage had several design similarities to the Y-wing, though instead of the Y-wing's engine pods the Ionizer was equipped with a pair of wings. The Ionizer was so named due to its primary armament of quad medium ion cannons. Secondary weapon systems included laser cannons and a pair of wing-mounted disruptor torpedoes. While the hull of the I4 was well armored, it was equipped with only light shielding. This was due to the interference caused by the craft's powerful ion weapons and its shield generator.