Staedtler Twistable Crayons have a twist action design that extends and retracts the crayon so there's no sharpening or peeling covers required. The colours are bright and vibrant to help your artwork stand out. The crayons are easy to use and don't require sharpening. They have a high break resistance. Each crayon has 6 mm lead. The pack includes 12 assorted crayons. It is recommended for ages 7 and above, but is suitable for all ages. They have a high break resistance.