This class of vessel was usually piloted by two Hunters, an Alpha-Hirogen and a Beta-Hirogen. The vessels were equipped with monotanium armor plating, and had dicyclic warp signatures. Inside the vessel was a large room which included the control stations as well as walls of trophies and bladed weapons. Also included was a harness-like construction to hang their prey on while preparing an osteotomy. (VOY: "Hunters", "Prey")
The USS Voyager first encountered a Hirogen warship in mid-2374, when they accessed the Hirogen communications network to receive the full message from Starfleet Command. Tuvok and Seven of Nine were hunted down and held as prisoners aboard this ship until Idrin told his Beta-Hirogen to kill their prey. (VOY: "Hunters")
Background information Edit
The Hirogen warship was designed by illustrator Rick Sternbach. Visual Effects Supervisor Mitch Suskin noted, "The Hirogen ship design that came from Rick Sternbach was neat, but I don't know if it really looked that good from every angle." (Cinefantastique, Vol. 30, No. 9/10, p. 98)
In Star Trek Online, these vessels are identified as "Hunter Escorts".