Is it illegal to sell rehabs on idle fish?

Not illegal.

The first class of medical devices is a low-risk, routine management can ensure the safety and effectiveness of medical devices, such as scalpels, surgical scissors, manual beds, medical ice packs, cooling paste, etc., its products and production activities by the location of the municipal food and drug regulatory authorities to implement the record management.

Business activities are all liberalized, neither permit nor record, only need to obtain a business license issued by the business sector.