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【SAFETY & STURDY】- The building blocks are made from non-toxic and elastic plastic material.Non-toxic, no glue and formaldehyde-free.Bright and slightly bendy to link together and stay together well,their projects remained intact no matter how tall or how large.Easy plug in and pull out, flexible, reusable and durable.Made of Environment-friendly Plastic, No Smell,No Any Harm to Babies.