Hygieia Dustless Board Chalk, 3.25" x 0.38" Diameter, Yellow, 12/Box

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): Yellow; Number of Colors: 1; Age Recommendation: Ages 5 and Up; Length: 3.25".