Spider Chalk manufactures 8oz chalk blocks out of pure, lab-grade magnesium carbonate that won't crumble or break. Say goodbye to the brittle 2oz blocks and never again waste time cleaning up puddles of chalk dust.
- Super-Mega Blocks last 2x longer than the same amount of regular, imported chalk. A single 8oz Super-Mega Block is equal to more than 1 lb of regular chalk. These blocks are denser, cleaner, dryer, stick better to your hand and last longer.
- Double-Refined, Ultra-Pure
- 2x The Absorbency, 2x The Dryness