The Kaweco Collection Marble Ocean fountain pen with an EF nib combines the art of classic writing with an exclusive marbled acrylic design. The combination of intense blue tones with a marble effect makes each unit truly unique in its visual pattern. The Extra Fine (EF) stainless steel nib provides an extremely precise and clean stroke, ideal for those with small and detailed handwriting. Its compact pocket-sized body transforms into a standard-sized pen when the cap is attached to the back. This EF nib version is perfect for meticulous writing in diaries, thin paper notebooks, and work diagrams.