I use a small chain K-190. The material is red copper. Comes with an adjuster of approximately 6cm, so the length can be adjusted. The listed length is from the end of the hikiwa to the first frame of the adjuster, and is the length when worn at its shortest length. *Chain length may vary by +-5mm. *The shape and size of the pieces may differ slightly depending on the lot. *As this is an accessory, the color may be changed to reflect changes in fashion. Also, during the processing process, color shading may occur without prior notice. (Some parts may differ in color from other parts.) *The shape of the adjuster has been changed. Please note.