These chalkboard chalks are made of gypsum materials, safe, and durable. In addition, the gypsum chalk writes smoothly and comfortable to use. Using these chalks, you can make stunning masterpieces on most surfaces such as white board and chalkboards. Features -Color:Random Color -Material:Gypsum - Size: 19.50X15.00X11.00cm/7.66X5.89X4.32in - Chalk is designed to be clean and easy to use, come with chalk holder for easy to use. - Sufficient quantity to satisfy your daily requirements for usage and replacement, meeting your diverse needs. - Chalk set, perfect for use by teachers, students, artists, and anyone else who wants to write or draw with ease and cleanliness. - The included chalk holder is convenient to use and clean, and can prevent the chalk from cracking. - With , use this chalk set to draw your own masterpieces. Package list: Chalks 5 x Chalk Sleeves 1 x Eraser 1