Caran d'Ache are high quality crayons for use in schools, colleges and by artists.
It can be used for all kinds of techniques including rubbings, sgraffitto, scraping, and even encaustic painting (by heating the crayons and applying to your work when melted, using a brush).
Usable on various materials such as: paper, cardboard, glass, wood, leather, fabric, stone and more.
Made in Swiss
Set option : 10, 10-M( Metal color), 15, 30, 40 colors
 
You will find more of this Neocolor's amazing feature from below link:
https://youtu.be/IU8RqwgMuuY?list=TLGGTSMfqOdz48kyMTAyMjAyMg