Billiard chalk by Peter De Backer.
Box of 2 chalks.
Anecdote: Cue chalk was invented in its modern form by the billiard pro player William A. Spinks and the chemist William Hoskins in 1897. It is made by crushing silica and the abrasive substance corundum or aloxite (aluminum oxide). (Wikipedia)
Tips: Chalk is sensitive to temperature and hydrometry changes, store in a dry place.
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