Pilot G-2 Gel Rollerball Pen, 0.7mm
Gel inkpens from Pilot exist in 27 different colors. It will give you a nice flow when you write or draw because of the easy flowing ink. Refills can be bought for the regular colors: Pilot BLS-G2-7 Gel Ink 0.7 mm Refill. You can also check out the thinner variant: Pilot G-2 Gel Rollerball Pen, 0.5 mm.