This is the nib of a fountain pen. According to my amateur research, it weighs 2.3g. I measured it several times, and it often showed readings between 2.1g and 2.4g. I'm using 2.3g as the most frequent value from 10 measurements. It doesn't register properly when measuring just a few, so I'm measuring the total weight! 【Remarks】 According to a friend who works for a buyer of precious metals, the estimated weights are: K21: 0.4g - 0.5g K18: 1.2g - 1.4g K14: 0.35g - 0.5g ○ Please note that the weight is based on amateur research and is not definitive. ○ Returns are not accepted. ○ Please comment if you have any questions.