If you're in the market for a new felt-tip pen , give the Faber Castell Ecco Pigment a try . I found them to be fantastic : r/ArtFundamentals
Technical pen - Wikipedia
Rapidograph Tg1-s, Thickness 1mm, Faber-castell School And Business Supplies Calligraphy Liners Fountain Pen Valentine's Day Gift - Multi Function Pen - AliExpress
Faber Castell Technical Pen .25+Koh-I-Noor+Rapidograph+Drafting+K & E+Staedtler | eBay
Faber Castell products including watercolour markers - Liz Steel : Liz Steel
My dad's old rapidograph set. It was made in West Germany. All pens work except the 0.13mm one. : r/BuyItForLife
Faber Castell Technical Pen .80+Koh-I-Noor+Rapidograph+Drafting+K & E+Staedtler | eBay
Faber-castell 0.1mm/ 0.3mm/ 0.5mm/ 0.7mm Artline Drawing System - Black (wallet (Original Version)
Faber-Castell Castell 9000 Series Graphite Pencil Jumbo Set of 5 | Rex Art Supplies