These chalk sticks are made from genuine calcium carbonate sourced in France, specifically crafted for chalkboard use. They move effortlessly without scratching, producing clean, precise lines. Easily erased without leaving any residue, they are dermatologically tested and free of dust. Gluten-free, the set features a refined selection of colors including red, orange, yellow, light green, green, sky blue, blue, purple, pink, and brown.