Stealth in Star Citizen resolves around being hard to detect via in-game systems, these being primarily radars and scanners. As mentioned previously in the Sabre Q&A, the Sabre and Eclipse are both built from the ground up around the concept of stealth whereas the Hornet Ghost was retrofitted to this mechanic. Not only does the specific hull design of the Sabre and Eclipse provide benefits to reduce their visibility on radar, but they are both equipped by default with Stealth-class items.