Black Brush Pen
My current favourite for Hand Lettering in my Bullet Journal- Sakura Brush Pens!
These Japanese import brush pens have a flexible nib that's much finer than that of Tombow pens- making them a super useful size for lettering in your Bujo!
Each Sakura Brush pen's has black micro pigment ink that's fade and waterproof when dry. This again makes them excellent for journalling as the colour wont bleed or run when you use them alongside highlighters or other coloured pens.
A superb brush lettering pen- also great for sketched and doodles!
This listing is for one pen- but you'll probably want a couple after you've tries them out! ;)