ZIG Kurecolor Refill Inks
Choose from 118 colors and a colorless blender, each available in a 25cc/bottle. The pens can be refilled through the tip and on average you should be able to refill one pen six times from one refill bottle. The refill inks can also be used for use with an airbrush. By using the refill blender you can create various gradation effects!
Also sold in multicolor sets!