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All information gathered first-hand, since 1995

The fruit of the horse chestnut is a spiny, green sphere about 4 cm diameter. When it ripens, the thick green husk splits to reveal one or more smooth brown nuts.

In Britain, the inedible nut is called a conker. Its main use is for a game: With your favorite conker tied to a string, you swing it against your competitor's conker until one of them breaks. The winner (with the unbroken conker) takes on all comers until the king of the conkers is established.