The building blocks are made of environmentally friendly ABS plastic, without BPA, designed for children over 3 years old. The surface is smooth and burr-free, so there is no need to worry about hand injuries. Extremely high precision and size, you can play with other brands, even if it is tall, it is not easy to fall.Rich scenes, added entertainment-Marble running, windmills, slides, trains, ferris wheels and other childrens dream playground scenes can be realized in this set of building blocks. Little angels can also use their imagination and creativity to create more things they like.The combination of entertainment and development-this kind of children's building block toy can not only provide hours of hands-on operation, let children enjoy the fun of building blocks, but also improve their color discrimination, logical thinking, hand-eye coordination, creativity, etc.