Ironlak 0.4mm Fineliner - Series 1 - Professional Fine Tip Art Design Draft Blackbook Pens 16 Colors - with Premium Acrylic Case 16 colors included in set Approx 0.4mm line width Fine tip pens with water based ink Ergonomic triangular shape for ease of use Great for use in blackbooks, eggshell and homemade stickers, sketchbooks, drafting, manga and comic art, ect