A sturdy ship that was designed to move quickly and hit hard, the Y-4 was equipped with a pair of retractable wings for emergency braking and increased maneuverability. Combined with meter-thick heat-dispersive armor and multiple layers of spray-on heat ablative coatings, the Y-4 could make full use of its impressive speed without having to slow down due to atmospheric friction. For this reason, the Y-4 was popular with Zsinj's Raptors for quick and quiet insertion onto a planet's surface.
Just under thirty meters long, the Y-4 had a small command crew of just one pilot and two gunners, and was capable of carrying forty troops, four AT-STs, and several PX-10 CAVws and military speeder bikes; folding assault ramps allowed both soldiers and vehicles to depart in seconds. A modest weapons platform, the Y-4 was armed with a pair of dual laser cannons and a concussion missile launcher for defense, and was able to provide copious cover for its occupants as they disembarked.