Crayola-Modeling Clay Assortment. Shape, build, and sculpt! Basic Colors pack. Crayola Modeling Clay is great for creating colorful forms and it won’t dry out, so you can make new creations again and again! This 4-1/2×3- 1/2 inch package contains eight modeling clay sticks. Comes in a variety of colors, each sold separately. Non-Toxic ASTM D-4236.