These bar magnets are particularly suited to younger pupils.The magnets possess good magnetic strength with very high resistance to demagnetisation whilst retaining a 'traditional' bar magnet appearance by virtue of the red and blue (for N and S) tough plastic casing.Dimensions: 80mm x 27mm x 10mmWARNING!Not Suitable for Children under 3 years due to small partsThis product contains magnets or magnetic componentsMagnets can cause serious or fatal injury if swallowed