The ink is made from water and food coloring, making it washable from almost all textiles. The case contains 60 felt-tip pens with interlocking caps, as well as twelve additional clips for connecting the pens. The special caps and clip system encourage your child not only to draw but also to build imaginative models, providing a playful secondary use. Additionally, a booklet with ideas is included to give your child extra inspiration for painting and crafting. Ignite your child's creativity with the Connector felt-tip pens from Faber-Castell.