Sealing Arm Braces

Three golden arm braces were used to seal Danzō Shimura's right arm. The braces were apparently used to keep the Sharingan and the life force of Hashirama Senju — both of which are embedded in Danzō's arm — in check. They require some time to remove as each brace is held in place by bolts. It would appear that the braces can also protect the Sharingans from view of a Byakugan, as shown by Ao seemingly not showing any knowledge of the multiple Sharingans implanted in the arm while still noticing Shisui's arm and Sharingan on Danzo.