Silicone and TPE are very common materials in solid dolls. In the initial selection of materials for physical dolls, silicone is the most one, because it has been used in other adult products for many years. The advantages of silica gel are low cost, good feel and high cost performance, but it is easy to tear and oil. Some well-known manufacturers still use silicone materials. TPE material has only become popular in recent years. It feels not weaker than silica gel, and its tear resistance and oil resistance are better than silica gel. Some new manufacturers, such as Chita dolls, mostly use TPE materials.