Description Peter Bock Fountain Pen Nib – 5mm Polished Steel Calligraphy Nibs Handwriting is a form of art, so to achieve the finest handwriting – A Fountain Pen is your best option. Bock is a well-respected name in the industry and their products represent high-quality and great value. Bock fountain pen nibs stand for precision and quality, and rank amongst the most prestigious in the world. 5mm Polished Steel Calligraphy Nibs are available in 1.1mm, 1.5mm and 1.9mm point sizes.