It's hard to do this product justice in an online description, so maybe you'll just have to try it for yourself. In nutshell, ArtGraf No. 1 Graphite is a clay that contains a high graphite content, so it's like Play-Doh, or modeling clay that you can draw with. Squish it into the shape you want, smudge it all over a surface, and then return it to its sealed plastic bag to re-use later.
Viarco is Portugal's one and only pencil factory. Founded in 1907, Viarco has done a beautiful job of preserving and sharing their Portuguese heritage while also constantly innovating unique new things.