1. Plastic material, safe and environmentally friendly, non-toxic and tasteless. 2. Rich color, high luster, high hardness, no deformation, can be repeatedly disassembled and assembled. 3. Develop children's initiative to solve hands-on ability, creativity and imagination, and stimulate children to explore and adjust their creative potential. 4. There are many patterns to choose from, and there is always one that suits your mind.