Extremely smooth for drawing, Stones Litho Crayons have very little drag. They're also extremely lightfast. The crayons are available in three sizes. A variety of hardness levels (#1 being the softest and #7 being the hardest) cater to a variety of styles and allow degrees of shading.
Half Inch Crayons — They are made from the same material as the Quarter Inch Crayons, but are designed for a more aggressive hand. Each crayon is round and measures about a half inch