1) smooth writing,no leakage,Non-toxic2) Super smooth writing-gel ink which is 800m for writing warranty, ink for 24 months cap-off drying3) Eco-Friendly ,various in assorted color4) Material ——metal, copper or steel; metal refill6) ink color and tip--black or blue; 0.5mm,0.7mm or 1.0mm7) promotional pen set looks simple and generous apperance, ideal for office pen, gift pen ,roller pen, logo pen, ...