This is a PILOT fountain pen. Both nib sizes are F. Cartridges and a converter will also be shipped together. For Search Purposes: Stationery, writing supplies, writing instruments, miscellaneous goods, accessories, mechanical pencils, ballpoint pens, markers, multi-color pens, multi-function pens, fountain pens, lead holders, drafting pens, pencils, discontinued items, Pentel, PILOT, uni, ZEBRA, Tombow, BIC, Newman, Staedtler, Faber-Castell, Caran d'Ache, LAMY, OHTO, Rhodia, Koh-I-Noor, Rotring, Sailor, Waterman, Pelikan, Parker, Luddite, Le Bonheur, Postalco, deep pen case, tool box, boat pen case, Vandy pen case, double zipper pen case, DELFONICS, Nohara Kougei, Koubou Kudzu, Craft A, steef, Mechanica, pmg, pg5, Smash, s20, Hexagonal, Orenz Nero, Kurutoga Dive, Orenz at, Kaweco Special, Jotter Core Line, Swift, Multi 8, Fine 4 Colors, Hosobuto, 2+1, Prismate, Acrylic, Bahagia, Ecridor, Custom, Limited Edition, Loft Limited, Itoya, 590&Co., Sharp Tank