Ballpoint Pen-it Is Smooth,Consistent Flow Writing biro and Doesn't Skip When Writing-it Is Paper Friendly and Smear Proof-it Has Great Quality and Is Affordable Plus It Comes in Packs of 50. 14 cms length with tiny writing point 0.5 mm and plastic body It has oil base ink and pigment, It writes smoothly on all kinds of paper It has the combined advantage of roller pen and gel pen, which is that it flows freely with a high viscosity to prevent smudge or leaks It is non refillable, economical and disposable