Where are combos manufactured?

Excuse me, but could you clarify where exactly combos are manufactured? I'm quite intrigued to know the specific locations or factories where these items are crafted and assembled. Are they produced in a single facility or distributed across multiple sites? Additionally, do you have any insights into the materials used or the manufacturing processes employed during the creation of combos? I'm particularly fascinated by the logistical aspects of this industry and how it all comes together to bring these products to market.