580 has increased ink capacity, about 30% more than 530. 580 has improved the smoothness of cap thread turning. 580 shows you our promise on continuous product improvement on small details.
Please note: ink is not included
A quick no-brainer guide to choosing nib sizes in an overly complicated fountain pen world: If you write small, go with an EF, For the normal writer, F is the most popular, If you tend to lean on a bigger font, M will be perfect, B is for statements!! Sign a check in B, write a header in B, and do some coloring/shading in B, Stub nibs are italic in writing style.
TWSBI, Fountain Pen - DIAMOND 580 AL R PUNCH PINK.