This PLUMIA Magnets for Kids STEM Learning Toys 3D Building Magnetic Blocks Construction set will provide hours of creative fun for your little ones. Made from non-toxic ABS plastic material, the large strong magnets are solid enough to support heavy and tall construction without collapse. The sealed rivets on the rounded-edges keep the magnetic building tiles from breaking, so you can rest assured that your kids are playing with the safest and most durable toys. This amazing set will help your kids develop their imagination, creativity and problem-solving skills while having fun.