Marble Magnets - Assorted - Pack of 50 £8.39 Quantity: at £8.39 each Add To Basket Encased within a plastic shell, magnetic marbles are an ideal introduction to the properties of magnets. Pack of 50. WARNING! Not Suitable for Children under 3 years due to small parts. This product contains magnets or magnetic components. Magnets can cause serious or fatal injury if swallowed. .