The Nei'hrr class was a type of Romulan attack raptor in service in the mid-22nd century. They were small, fast sublight craft, whose typical crew was only a pilot. Armaments consisted of a directed energy weapon (type unspecified) and a bomb or torpedo with a nuclear fusion warhead. Larger, warp-capable Birds-of-Prey were used as carriers or tenders to transport squadrons of Nei'hrrs over interstellar distances.
Nei'hrrs were used extensively in the opening stages of the Earth-Romulan War to circumvent the warp field detection grid designed by the Vulcans and employed by worlds of the Coalition of Planets. (ENT novel: Beneath the Raptor's Wing)