Brand new German U-Boat Type XXI Submarine (Challenging Difficulty) Steel Model Kit by Metal Earth. Brand new box. Detailed exterior. Includes 67 parts. Has a display stand. Highly detailed model kit. Officially licensed product. Difficulty level: Challenging. This model does not have any openings. Assembled dimensions approximately L-7.48 W-0.79 H-1.57 inches. No glue or paint is required but tweezers or similar tools are recommended. German U-Boat Type XXI: Were a class of German diesel-electric submarines designed during the Second World War. They were the first submarines able to operate primarily submerged rather than spending most of their time as surface ships.