I've finally got Orenz nero 0.3mm. It looks like plastic but it's heavy like metal. You don't have to knock when you need more lead. It comes out automatically, and you can
Review: Pentel Orenz Nero Mechanical Pencil
Pentel orenz Nero : standard and limited edition. Very subtle difference between the 2 versions - mechani… | Mechanical pencils, Pen design, Architecture blueprints