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Popular Primary Schools Resource!
 
Set of four powerful alnico magnets with keepers. 
The set includes two bar magnets measuring 3-1/8 in. x 9/16 in. x 3/8 in., one small horseshoe magnet measuring 5/16 in. W x 1 in. H, and one large horseshoe magnet measuring 9/16 in. W x 1-3/8 in. H.