Ships of this type were fitted with sophisticated cloaking devices called polarization cloaks. They were heavily armed with proton weapons. Ramurans rated their ships to be fast, and capable of keeping up with USS Voyager. They were operated by a single pilot.
In 2374, Kellin piloted a vessel of this type in an effort to return to the USS Voyager where she had previously fallen in love with Commander Chakotay. She was successful in returning, however the ship was later attacked by two more cloaked vessels of this type. It was only by modifications to the sensor array that Voyager was able to detect the ships, which soon retreated. (VOY: "Unforgettable")