This is an K18 screw chain. It also has an adjuster. Price is not negotiable. I purchased this last year, but it's not easy for me to use, so I'm selling it to fund the purchase of another chain. The price may increase in the future due to fluctuations in the price of gold. Chain width: Approximately 1.1mm Weight: ・45cm Approximately 0.79g This information is from the time of purchase. #NecklaceChain