This is a Jinhao retractable fountain pen. Thank you for viewing. ・JINHAO 10 series fountain pen. ・Nib: Stainless steel 　Size: EF (similar to Japanese MF) 　Mechanism: Converter and cartridge compatible 　Length: Approximately 142mm 　Thickness: Approximately 13mm (body) 　Weight: Approximately 33g 　Accessories: Built-in converter 　Comes with a case ・A converter is included, so you can use it immediately if you have ink. It closely resembles the Pilot Capless, and the nib unit inside is also compatible with Pilot. Pilot cartridges also seem to be usable.