Features flexible nylon fiber brush tip on one end and a fine tip on the other end Brush pressure can be used to create medium or bold strokes Ink is water-based blendable, odorless and non-bleeding Acid free and non-toxic 48 blendable colors in a flexible brush and fine tip pen. Water-based ink and acid-free. Preferred by professional artists and crafters. Available in either bright or pastel colors and packed six or ten per set.