Board Thread:General Discussion/@comment-68.174.142.74-20140314035024/@comment-82.30.114.96-20140517025946

it is said they are made of complete life fibre during the anime (to lazy to search episode)

the decapitation made is indeed caused by an extension of transformation, and in turn the blade possesed by Nui did transform, both when combined into scissors to become double decapitaion mode. and while Nui used them to become a double bladed sythe like weapon.