Pilot’s G1 0.5mm gel ink pen is a pioneer product which introduced the Japanese gel pens to the world. This pen offers smooth and effortless writing experience. Hence, it became very popular first in Japan and then soon to the rest of the world. It is famous for its smoothness as well as its razor-sharp precision in writing. The ink comes in 3 colours, i.e. black, red and blue. The refillable cartridge makes the product less wasting and environment friendly.