I use Kihei Chain 130SRA. The material is red copper. Comes with an adjuster of approximately 5.5cm, 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. Wires with a wire diameter of 0.2 mm can be passed between the pieces, and a C ring, T pin, and 9 pin with a wire diameter of 0.5 mm can be passed through one cut end. Depending on the time of arrival and the item, it may be difficult to pass through, so in that case, please use perforations to spread out the chain links. *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. Please note. (Some parts may differ in color from other parts.)