Board Thread:Theories and Speculation/@comment-45444155-20200804084623/@comment-6769189-20200806074142

He didnt create an actual TSB, which was th point i was trying to make about a sword carved from wood not being steel, as true sword would be. Clearly that went over your head. He created a pseudo-TSB using Black Zetsu's naturally malleable body.

The databook says that it is high density chakra that change shape. The nature transformations give them actual physical properties.