Crayola Fun Effects Mini Twistables Crayons, 24-Count,  1 pack Special Effects. Metallic Crayons provide shimmering effects on white and dark paper. Mini Twistables with colorful, special effects. Includes Metallic, Neon, and Rainbow Twistables crayons New Colorful effects give kids creation a boost. Super Bright Neon Crayons for art with an edge. Sturdy plastic barrels resist breaking and crayons never need to be sharpened.