Rainbow Blocks Crystal Bead Polymer Triangular crayons combine anti roll benefit ERSCTUFF2995 Triangular crayons combine anti roll benefit with the grip needed for proper writing grip developmentNon washable formula appropriate for school aged childrenTriangular shape is excellent for texture rubbings easy to hold and create broad strokes of color16 assorted colors of triangular shaped crayons: Red and Social Studies content at the same timeCustomized teacher parent tips and after reading activities included with each bookStart with Volume 1 of the books Eight blocks per package: 4 rectangle and 4 half moon shapes light and sound