These fine wax crayons from the Japanese brand Kitpas are made from rice wax.
The crayons are used by real artists, specially produced to make the most beautiful drawings on, among other things: paper, windows, mirrors, glass and whiteboards

The crayons are water soluble for watercolor effects.
The artworks on smooth surfaces are easy to remove with a damp cloth (not paper)

The wax crayons are made of rice wax oil with colored pigment. This rice wax oil is made by recycling a residual product of rice preparation, namely the rice husks
 
Product Information:
Content: 16 pieces
Recommended Age 3Y+