Kokuyo Clear Crayons are made of mineral oil, making them safe for kids to use. Unlike pastel colors, these crayons are transparent, so they have a watercolor-like quality. The colors can easily be layered and blended together to create different color shades. 
 
Available in 10-color and 16-color sets.
 
The 10 color set includes Blue, Brown, Green, Light Blue, Light Orange, Orange, Purple, Red, Yellow, and Yellow Green.
 
The 16 color set includes Aqua Blue, Blue, Blue Green, Brown, Dark Brown, Gray, Green, Orange, Pale Orange, Pink, Purple, Red, Ultramarine, Yellow, Yellow Green, and Yellow Orange.