For decades, there has been basically one choice in lithographic crayons. Now Stones Crayons gives lithographers an alternative. These crayons are insoluble in water and will not smear under gums or dissolve with water washes. They are also very smooth, capable of producing a range of markings from delicate tones to solids. The student Intro Set includes 1/2" crayons (#1,3,5), 1/2" crayon holder, #3 tablet crayon, deletion hone and sharpener.