Tombow Dual Brush Pen ABT is a "brush + fine print" twin-type graphic marker that has been favored by designers leading the art scene. A twin-type marker with a flexible fiber core that looks like a brush and a 0. 8mm fine core. This set includes 23 colors and one colorless blender pen. The durable flexible fiber core can draw from fine lines to thick lines. In addition, 0. 8mm fine core can draw a line with constant thickness. Colorless blender pens can mix colors gently and create gradients and watercolor effects.