Beautiful extra thick bars with a large colour output in an assortment of six bright colours. Due to the thickness and strength of the chalk, it's very durable. Especially suitable for rough surfaces such as paving stones, etc.
Safety Data sheet, tested to conform to European Toy Safety Laws. They do not contain any other raw material but calcium sulphur, water, and colouring pigments, safe for children, and tested to be free of heavy metals and of a purity similar to food stuff.