| Class | Shields | Hull | Armor | SIF | 
| Type | Capacity | 
| D'Deridex Class | Standard | 2,295,000 | Standard Duranium / Tritanium Double | 11 cm High density | Standard | 
| Early Bird of Prey | - | - | Standard Monotanium Single | 1 cm Polarised | Standard | 
| Narada | - | - |  | - | - | 
| Norexan Class | Standard | 3,240,000 | Heavy Duranium / Tritanium Double | 8 cm High density | High | 
| Romulan Bird of Prey |  | 40,500 | Light Monotanium Single | - | Low | 
| Romulan D7 Class
 (Klingon import, figures for 2265) | Standard | 81,000 | Heavy Monotanium Double | 5 cm High density | Standard | 
| Romulan Science ship | Standard | 67,500 | Standard Duranium / Tritanium Single | 2 cm High density | Low | 
| Romulan Scout
 (Modified Science ship) | Standard | 67,500 | Standard Duranium / Tritanium Single | 2 cm High density | Low | 
| Scimitar Class | Primary and secondary [1] | 2,160,000 | Standard Duranium / Tritanium Double | 9 cm High density | Standard | 
|  | 
| Class | Shields | Hull | Armor | SIF | 
| Type | Capacity | 
| Romulan Shuttle | Standard | 40,500 | Light Duranium Single | - | Low | 
| Scorpion Class | - | - |  | - | - |