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Packs of 4, Reaction balls are intended to help develop concentration and quick reactions These six-sided moulded rubber balls are designed to be thrown or dropped onto a hard surface to produce an unpredictable bounce Assorted colours Available with a 70, 100 or 200mm diameter, Reaction balls are intended to help develop concentration and quick reactions. These six-sided moulded rubber balls are designed to be thrown or dropped onto a hard surface to produce an unpredictable bounce! Assorted Colours. Available with a 70, 100 or 200mm diameter. Sold in packs of 4.