Crayola Fun Effects Twistable Crayons are a fun twist on everyday coloring activities. Clear plastic barrels show the color inside and keep the core from breaking. A simple turn pushes the wax out of the barrel for continuous drawing and coloring without stopping to sharpen or peel paper. These Crayola twistables fun effects mini crayons feature rainbow, neon, and metallic shades to create special effects on illustrations. 24 crayons.