Magnesis® Iron Ferrite Magnet Ball 25mm Diameter Educational Intelligence Stress Relief Toy (8 Pieces)

描述

Ferrrite Manget Balls are great fun and educational for the mechanisms of magnet function. Select from sets containing 2, 4 or 8 magnets. Each magnet is 2.5cm in diameter and made from an iron alloy. Try making the magnets 'sing'!