Nihon Rikagaku Slim School Chalk Set of 6

Do you associate chalk with dusty, respiratory-irritating lime-based sticks?

Nihon Rikagaku Industry, a long-standing Japanese brand that started with chalk, has overcome the drawbacks of traditional chalk. They grind abundant discarded scallop shells from Hokkaido into powder and mix it with natural limestone to create dustless chalk. Calcium carbonate (from shells) is heavier than lime, so writing with it produces minimal dust and significantly reduces wear. 

• Size: Length 2.5 inches (63 mm) x Diameter 0.3 inches (7 mm) (
• Colors: Yellow, Red, Green, Blue, Purple, White
• Material: Calcium carbonate (including scallop shell powder)
• Set Includes: Yellow x 1, Red x 1, Green x 1, Blue x 1, Purple x 1, White x 1