The vessels used by the Skrreea were of various designs.
The Skrreea were farmers who had been used as laborers and servants for centuries. When they finally were freed sometime before 2370, they gathered any ships they could get their hands on to search for the "Eye of the Universe" that would lead them to the legendary home world of the Skrreea, Kentanna. Three million Skrreea were carried by these ships through the Bajoran wormhole when Haneek discovered it in 2370. (DS9: "Sanctuary")