This is an injection-plastic ship model kit.
Yes, in WWII the Japanese Army had their own submarines to help move supplies...I guess they didn't trust the navy boats! This kit of the Maruyu Yu-1001 is actually several kits in one: You get the standard full-hull kit with parts sharply molded in light gray to build one complete submarine, plus extra clear hull parts are included if you want to show off interior detail parts. But wait! You also get a complete kit of the sub in 1/700 scale! Both scales feature a nice stand. There is also a fret of photo-etched metal detail parts for the 1/350 version, and decals for both. So, you get a choice of two versions in 1/350 (regular or clear hull), plus one full kit in 1/700...a great modeling value!