Prang Hygieia Dustless Board Chalk, 3.25″ x 0.38′ Diameter, White, 12/Box 3.3″ Length x 0.4″ Diameter – White – Non-toxic – 12 / Box (31144)

Nearly pure, 95% calcium carbonate is free of all materials that could scratch, streak or pit your board surface. Special mineral cohesion agents ensure clean, dust-free use. Standard cylindrical design fits most chalk holders. School-approved, nontoxic. Color(s): White; Number of Colors: 1; Age Recommendation: Ages 5 and Up; Length: 3.25″.