Cont Paris Sketching Crayons are ideal for sketching. Very soft when applied, theyre made from natural pigments (iron oxide, carbon black, titanium dioxide), clay (kaolin) and a binder (cellulose ether).They are suitable for all types of grain papers (mainly mid-tone papers), canvas, or various surfaces with irregularities. The crayons are compatible with soft pastels and pastel crayons. A must-try!