Educational trainer

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Made of cobalt steel 12mm diameter, in pairs half red and half blue to indicate north
& south poles with keepers, size (a) 50mm (b) 75mm (c) 100mm

Made of cobalt steel 12mm diameter, in pairs half red and half blue to indicate north
& south poles with keepers, size (a) 50mm (b) 75mm (c) 100mm

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