If you have a special appearance, you can apply for an appearance patent, but to be honest, appearance patents are just a make-up and are generally more useful for product packaging bags or bottles.
If the structure and function are special, you can apply for a utility model patent, because utility models do not require substantive examination. As long as you find a patent agency, you can usually get approval.
If the technology for making stainless steel barrels is advanced, you can apply for an invention patent. However, invention patents need to pass a substantive review, which has high requirements on the novelty and practicality (technological advancement and effectiveness) of the process technology. Moreover, the review takes 2 to 3 years, and the cost is also high. It is not extremely necessary and generally not preferred.
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