Innovation comes with the magnetic closure for both capping and posting the fountain and rollerball pens. The weight and balance of this collection creates supreme writing performance. Fountain pen fills with Monteverde® standard international G3 ink cartridges or piston ink converter (included).The flexible stainless steel nib is available in extra fine, medium, broad and stub sizes. Ballpoint accepts P1 and P4 refills and the capped rollerball accepts the G2 and W2 refills.