Attack ships are armed with a phased polaron beam, that can punch through Starfleet shields, even when harmonically altered. They also have a deflector which prevents tractor beams from locking on.
The ships' interior reflects Dominion designs — all crew stand, as there were no chairs, and all ships neither have food replicators nor a viewscreen. One such ship informed Deep Space Nine of Benjamin Sisko's capture.
It was later discovered that these ships could be damaged if attacked from above.