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Kids love playing with the 3D Developmental Building Blocks! It is an open-ended construction toy and the oversized ergonomic shaped pieces are designed for younger children to explore magnetism safely and learn about its attractive and repulsive properties. Meanwhile, older children will have fun using the pieces to construct various more complex 3D structures. The pieces are light in weight and come in an assortment of vibrant colors - red, blue, green and yellow.