PILOT"CUSTOM 823 - Plunger Type/Transparent Brown" (nib : Medium) Strange , but genealogy of "CUSTOM" "Plunger system" - can pump up more ink (1.5ml) Skeleton body - you can enjoy mechanism visually. 14K (#15) nib - Majestic. Moderate softness and toughness for writing. Equipped accessories : elegant gift box (filling mechanism is bulit in).