Hygieia Dustless Board Chalk, 3 1/4 x 3/8, 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 1/4".

Price: 0.79 from Zuma Office Supply US