these versatile gel crayons. The 12 brilliant colors make smooth, bold strokes with shimmering effects that show up on both white and black paper. The metallic colors are easy to smudge/blend and when used with a wet paint brush will give art projects a fun watercolor effect. Designed for ease of use, these crayons have a thick contoured grip, twist up, and are water-soluble.- Durable plastic case with snap-top opening allows for easy storage and is perfect for taking on the go.