Fitted with stainless steel nib. Fitted with twin-channelled ink feed and collector system. For use with ink cartridges or convertible to ink bottle filling. Clip material: Stainless Steel. Vector's style and durability make it a delightfully easy to use rollerball for students and professionals alike. Focused on providing good value performance, the Rollerball FreeInk Technology assures a consistent and fluid writing experience every time. The simple functionality of Parker Vector with its basic cylinder shape and the famous Parker Arrow clip deliver a perfect sense of balance in the hand. Your writing has never been more consistent. Parker Vector is the most delightfully broad range covering every type of writing and a great variety of materials. Creativity has its writing partner.