Hygieia® Dustless Board Chalk, Yellow, 12 Per Box, 36 Boxes

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. Each box includes 12 pieces of chalk. Sold as 36 boxes for a total of 432 pieces.

Key Features :

i : Superior chalk is 95% pure calcium carbonate and free of foreign materials
ii : Round stick 3-1/4" x 3/8"
iii : Makes clean, smooth lines and erases easily
iv : For use on natural slate and similar surfaces