Sennelier Oil Sticks are made from pure concentrated pigment, the finest safflower oil, and high quality mineral wax, they can be used alone or in combination with tube oil paints. Like regular oils, they can be diluted with turpentine. 

These creamy, very lightfast sticks can be used for sketching, or for producing complete works of art on any traditional oil painting surface. They are rich in texture and easy to use.They dry to a hard film.

** Do note that oil sticks can get 'melty' in texture in our humid climate in Asia but it does not affect the quality of colours.

Also see:

• Sennelier Artists' Extra Fine Oil Colours
• Sennelier Etude Student Oil Colours 

http://www.vibrant-art.com/oil-paints-artist-student/