CRAYOLA-Twistables Extreme Colors Crayons. Crayola Extreme Colors are a new line of intense colors for those who like to create on the edge! When your school project, report, or work of art needs that extra 'kick' it's time for Extreme Colors! Twistables crayons feature break-resistant plastic casing and never need sharpening- just twist and color! This package contains eight intense color crayons. Conforms to ASTM D 4236. WARNING: CHOKING HAZARD-Small Parts. Not for children under 3 years. Imported.