Dual brush pens have a versatile, flexible nylon fiber brush tip on one end and a fine tip on the other end. The resilient nylon brush retains its point. Water-based, non-bleeding ink is blendable. Set includes one dual-tip colorless blender plus nine pastel colors: carnation, light ochre, lilac, mint, mist purple, pale yellow, pink, process blue and sky blue. Acid-free. AP Seal, non-toxic.