The object of copyright is a work, and Article 3 of the Copyright Law stipulates:
The term "works" as mentioned in this Law includes works of literature, art and natural science, social science and engineering technology. Created in the following form:
(1) Written works;
(2) Oral works;
(3) Music, drama, folk art, dance and acrobatic works;
(4) Artistic and architectural works;
(5) Photographic works;
(6) cinematographic works and works created by similar cinematographic methods;
(seven) engineering design drawings, product design drawings, maps, schematic diagrams and other graphic works and model works;
(8) Computer software;
(9) Other works as prescribed by laws and administrative regulations.
As for the belt you mentioned, it is a patented product, and the technology or method for producing the patented product can apply for patent protection. Patented products are protected by patent law.
I hope the above answers are helpful to you.