Gel Multi Pen

By Livework. 

These are pretty sleek for multi pens. They writes super smoothly, with a fine 0.4mm line.

Available in 2 colour ways: 

White, which has Black, Green, Red and Blue inks. 

Indi Blue, which has Black, Lavender (although I'd call this fuchsia), Brown and Blue-Black (Teal) inks.