Kuretake's Sumi Ink 60 comes in a 60 ml bottle and is best suited for illustrations and comic work. Note that once the ink is dry, it is not waterproof but it is smudge-proof.
Sailor Shikiori Twin Head Brush Pen (Set of 20)
Sailor Shikiori Twin Head Brush Pen (20 individual colours)
Moblique - 2-in-1 Penholder - Purple Sand
Moblique - 2-in-1 Penholder - Silver Storm (Chrome)
Kuretake Zig H20 Detailer Water Brush Fine