Young artists will delight in using these amazing Shimmer Gel Crayons! 12 brilliant colors make smooth bold strokes that shimmer! Colors pop on both white and black paper. Metallic colors are easy to smudge-blend, too. Crayons are also water-soluble. Use with a wet paintbrush to give art projects fun watercolor effects. Twist-up mechanism makes crayons easy to use and keeps hands clean. Thick contoured grip is perfect for smaller hands. Set of 12 comes in a sturdy plastic case with a snap-top opening that allows for easy use and safe storage. Perfect for taking Shimmer Gel Crayons on the go! Each crayon measures 5. 1'' long. Case measures 8. 5'' wide x 5. 5'' high x 0. 88'' deep.