Approximately 63cm long. This is a set of 5 silver-colored necklaces, weighing either 11 or 12g (possibly 12g, as they feel slightly heavier). The material is unknown. It's difficult to tell from the images, but they are not circular rings. Therefore, you cannot attach parts using jump rings. My father bought a large quantity of these a long time ago and kept them in a plastic bag. I don't know why he bought them. Perhaps they were a good deal, or maybe he intended to use them for magic tricks. I still have some in stock. I think they can be used for handmade crafts. Keywords: Handmade materials, supplies, parts, necklaces