Popular Magnetic Building Blocks Mine World Set Toys STEM Montessori Stacking Cubes Construction Set Great GiftSPECIFICATIONS Build your Mine World. Endless fun for all Ages Kids. Magnetic Blocks to keep your creation together and expand. Great STEM Toy for Kids. Stem Toys are Science, Technology, Engineering, and Math based toys geared towards learning, curiosity, and education. Enhances child's creative thinking, STEM and Motor skills, Hand Eye Coordination, Concentration & Patience, and great Childe Parent Cooperation. Material: ABS Plastic