This is the nib of a fountain pen. Based on my amateur research, it weighs 2.3g. I measured it several times, and the readings were often between 2.1g and 2.4g. I've taken the most frequent value, 2.3g, from 10 measurements. It's difficult to get an accurate reading when measuring just a few at a time, so I've measured them in total! [Notes] According to a friend who works for a buyer of precious metals: 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. ○ Please feel free to comment if you have any questions.