Ultra-light clay is a kind of paper clay, referred to as ultra-light soil. It is easier and more comfortable to pinch, more suitable for modeling, and the works are lovely. Popular in Japan, it is a new type of environmentally friendly, non-toxic and naturally air-dried hand modeling material. It is mainly made of foaming powder (vacuum microspheres) made of polymer materials, and then physically mixed with polyvinyl alcohol, crosslinking agent, glycerol, pigment and other materials in a certain proportion. Clay itself is safe and non-toxic, but its components contain organic foaming powder and preservatives. Because the foaming powder is light, it is strongly adsorbed by objects, and preservatives are harmful after inhalation, so 3-year-old children should be avoided to play independently and prevent children from putting it in their mouths.