GENERAL PENCIL-Factis Plastipastel Crayon Set. Plastipastel Crayons are plastic crayons that do not melt and do not roll because they are hex shaped. They color like fine quality colored pencils and are not waxy like traditional crayons. Erasable, easily sharpen, non- toxic and conforms to ASTM D4236. This package contains 24 hex shaped crayons in assorted colors. Imported.