This Brass Rollerball Pen from Ystudio has been hand crafted with brass and copper, resulting in a beautiful writing tool that is well balanced and very responsive. Due to the brass and other materials used, over time this Pen will oxidise from oxygen and skin contact to produce a beautiful and unique patina. Ystudio pens and pencils are made with the highest quality materials and all their products are expected to last a lifetime. - Brand: Ystudio - Rollerball Pen - Made from Brass - Over time the brass will oxidise to produce a unique patina