The Pitt Artist Pens feature pigmented India Inks that are lightfast, acid-free and pH Neutral. The ink is odorless, waterproof and permanent once dry on porous surfaces. They work beautifully on all types of papers and canvas. The ink will also not bleed through paper making them ideal for sketch books. The 1.5mm Bullet pen creates uniform strokes with high opacity. With a flexible nib of 1 to 5mm, the Brush pen has a unique workflow that provides different line intensities for your desired outcome. The Calligraphy pen has a wedge-shaped nib, perfect for fancy block lettering and handwritten text; calligraphy and journaling. Fude Medium is one of the latest nibs added to the Pitt Artist Pen collection. Although similar to a brush nib, fude is a little shorter and creates a more stable design. The convenient wallet is made of 100% recycled plastic and provides storage for “on the go” artists. Use for bullet journaling, sketching, illustrating, hand lettering and more! Contents Include: 4 Pens #199 Black Nibs: Bullet (1.5mm), Brush, Calligraphy and Fude Medium in a recycled plastic wallet