Twistables are twist up crayons in durable plastic barrels. The crayons are extended and retracted by twisting the end. No sharpening or peeling necessary! The Erasable Twistables have a built-in eraser. The 8-Color Metallic Twistables are perfect for use on black or dark colored paper; the colors shimmer and shine for a unique effect. The 8-Color Rainbow Twistables have 4 different colors in each crayon that create unique multi-colored drawings. The 16-Color Set has bright colors, a teacher-preferred color palette. Neon Twistables colors produce a unique glow effect. Mini Twistables are a fun, easy to hold size. All are AP certified non-toxic.