The B'rel and K'vort class vessels are better known as the Bird of Prey. These are practically identical in appearance, just that the B'rel is much smaller than the K'vort. They serve with distinction in the Klingon fleet, always taking heavier losses. These ships are armed with photon torpedoes, wing-mounted disruptor cannons, and cloaking devices.

The B'rel class

The K'vort class