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 10 colors: black, brown, burnt sienna, cappuccino, light sand, opal, pale cherry, redwood, saddle brown and sand. Acid-free. AP Seal, non-toxic.