Gioia Partenope combines fountain pen and rollerball pen with an interchangeable grip section that allows you to choose your favorite writing instrument just before use it. Unscrew the grip part with the fountain pen nib and screw the grip part with the ballpoint pen refill and start to write again! Partenope Black Sand features a satin black resin with the Italian flag on body between two rhodium rings. The beauty of Naples gulf with the mount Vesuvio behind is engraved on cap. Fountain pen is fitted by a steel nib and fills ink via standard cartridge/converter. The "rollerball" replacement grip part accept standard ballpoint refills.