Delta-IV boosters are a mid size booster used in making the Delta IV Heavy rocket. It is the only booster in Space Agency that will cut thrust if you release the engine control button, due to it being liquid fueled.

Delta IV Heavy Boosters
Delta IV Heavy Boosters
Delta IV Heavy Boosters, attached to Delta IV Core Stage.

Lifting Power 4/6
Fuel Capacity 2/6
Engine Restart No
Maneuverable No
Attach Payloads No
Attach Boosters No
Dockable No

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