Dustless Water-resistant Chalk - White (Set of 6) - Nihon Rikagaku

Made primarily from scallop shells, it produces less powder and is soft to write with.
It can be used twice as long as plaster chalk, making it economical.

The main ingredient, calcium carbonate, is the same ingredient used in toothpaste and is safe for the body.

The coating makes it easy on the hands and keeps it clean.
It is an all-weather type that will not fade even if it gets wet, making it ideal for outdoor blackboards.

Uses
Construction chalk.
Materials/Finish/Set Contents/Accessories
Calcium carbonate.
Scallop shell powder.