These are really high quality strong magnets. It's hard for my son to understand that you can only wear one of these at a time, otherwise they're repulsive. My 5 year old son loves it and makes all sorts of vehicles, "crystals". It was a good way to emphasize three-dimensional shapes. We also have Picasso tiles and I can say these magnets are stronger and smaller, but we really like both sets. PicassoTiles 60 Piece Set 60 Piece Magnetic Building Tiles Transparent 3D Magnetic Building Blocks Building Game Boards - Creativity Beyond Imagination Inspiring Fun Educational Ordinary
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