New Design - This magnetic tiles set features style improvements that enhance the building experience. Rivet Reinforcement - Rivets replace plastic nails to make tiles stronger and more durable. Stronger Magnets - Doubled magnets create stronger connections between blocks for more stable constructions. Concave Design - Reduces surface scratches while improving light transmission for beautiful visual effects in sunlight or under lights. Happy Growth - Children develop strong color sense, geometrical shapes including 3D forms, numbers, counting, magnetic polarities and architectural design at early age through play. weight: 3.32 pounds.