Well known brands like Staedtler, Tombow and Stabilo seem to have the monopoly over water-based pens used for adult colouring, but not many people know that pens aimed at children can be just as good
Fibracolor Fiber Pen 100set
Fibracolor Colorito Pens - Colour with Claire
ColorMaxi Coloring Markers Tub of 36 - The Learning Store
Fibracolor Water-Based Pens - Colour with Claire
Fibracolor Megastampers! - Colour with Claire
Fibracolor Aquarello Pens & Pencils - Colour with Claire
Compare prices for FIBRACOLOR across all European stores
Colour Fiber Tip Pens Panda 61821538
Fibracolor Fiber 100 Pen Set - Markers from Graff City Ltd UK