 An "ojime", or bead, is provided on the cords between the inro and netsuke to hold the boxes together.This bead is slid down the two suspension cords to the top of the inro to hold the stack together while the inro is worn, and slid up to the netsuke when the boxes need to be unstacked to access their contents.inro were made of a variety of materials, including wood, ivory, bone, and lacquer.