1. Ice material: stored in the ice layer in Siberia and other regions, relatively complete, less affected by oxidation, without spots and traces, and of good quality among raw materials. 2. Frozen soil: the quality is not as good as ice, with cracks and relatively rich colors. 3. Soil materials: The dental materials buried in the soil are severely calcified, waste a lot, and have poor luster and wettability. 4. Molar teeth: Different from the above raw materials, they are not the front teeth of mammoths but the fluted teeth, which are generally petrified and have unique textures. Each material is also graded. For example, Grade 3A ice is better, followed by 2A, 2B, etc. , mainly distinguished by the moisture and cracks of the material. Mammoth's tooth carving is a good choice. Generally, the ice is found at the source of 3A, and the finished product is of good quality.