Utility models are protective structures and do not require physical objects, but you must confirm the following points:
1. Your invention is innovative, at least similar to the existing ones. The difference. The specific definition is very complicated. If there is no novelty and creativity, even the application will be invalid.
2. It is structural and cannot just replace the material, such as replacing a plastic heating kettle with a metal one.
3. The application documents are roughly: letter of request, fee reduction request, fee reduction certificate, abstract of the description, drawings of the abstract, claims, description, and drawings of the description.