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.