20 Colored Pencils: The package contains 20 building block crayons. Each crayon has 11 colors, corresponding to 11 detachable small crayons. Enough for kids to use and replace every day, or to share with their friends and classmates. Safe Aand Durable: The crayon refill is made of paraffin wax, and the pen case is made of plastic, which is lightweight and easy to hold, bringing you bright and fresh colors. Safe for kids and toddlers, your kids can use these stackable crayons with confidence. Adjustable Size: The total length of crayons is 10 inches, and a single small crayon is 1.5 inches. You can change the position of the color and the length of the pins yourself. Holds securely in a child's hand and won't chip, stick or smudge. Colorful Designs: These colorful crayons are buildable and disassembled, kids can assemble these crayons and pencils into different shapes. There are 11 colors of crayons, rich colors give you more choices, and one pen can solve simple painting problems. Kids Gifts: These rainbow stacking crayons make drawing, painting and artwork fun and enjoyable, suitable as kids birthday boy and girl party gifts, Christmas gifts, Easter gifts for kids, classmates, students or friends.