Deadweight capacity is approximately 6,200 metric tonnes. The Stream RoRo design features one stern ramp and fixed ramps connecting the three cargo decks. Typical cargoes include trailers, cassettes, cars, other roll-on/roll-off (RoRo) units, and forest products. The vessels are also capable of carrying containers, reefer units, and various types of dangerous goods.

The Stream RoRo concept was developed in collaboration with Technolog Services in Hamburg, Germany, drawing on extensive experience from Godby Shipping's existing and previous vessels. Particular emphasis has been placed on minimizing fuel consumption through advanced computational fluid dynamics (CFD) modelling and tank testing. Cargo capacity is expected to be 70–100% greater than that of the current vessels MIMER and MIDAS, while maintaining the same fuel consumption.

The new vessels will be fitted with shore power connections and batteries to enable emission-free operations in port and over short sea distances. Battery capacity can be expanded in the future and supplemented with new emission-free power generation technologies. The design also incorporates preparations for a waste heat recovery system and compatibility with alternative fuels such as methanol.

Construction is scheduled to begin in June and November 2027, with launches planned for May and October 2028. Deliveries are expected in September 2028 and January 2029.

Each vessel will provide employment for approximately 50 crew members onboard. Godby Shipping intends to register the vessels under the Finnish flag. Like the company's other RoRo vessels, they will feature a high Finnish/Swedish ice class 1A.

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