This is a smart pen design for Honor fold-able phone years ago. It's a real product as an high-end accessory of fold-able phone. The unique feature of the design is on its pen cap which has double curved surface that flowing down from the top point. The smooth glossy surface of stainless steel MIM pen cap can reflect back the flowing and changing light and shades.  It spent half year to follow the test and some other details of material issues and the process of trial production. 

Anyway, It was a long story and a long memory.  So glad to see it came onto the market successfully.