1) Smooth writing, no leakage, non-toxic
2) Super smooth writing-gel ink which is 500m for writing warranty, ink for 18 months cap-off drying
3) Eco-Friendly ,various in assorted color
4) Material —— copper or steel; metal refill
5) Size of pen —— 138*12.5mm     
6) Ink color and tip--black or blue; 0.7mm or 1.0mm
7) Bosch Pen metal pen looks simple and generous apperance