mintage limit vs product limit

so on the us mint website for the 1/4oz gold eagle it said this


Mintage Limit: 30,000
Product Limit: 10,000







what does that mean? they seem like the same thing but why the 20,000 difference?

 

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The coin is/will be/could be offered in other products. The mintage limit is for the coin in all products.

 

Singles are at 10,000.
4-PC Set at 20,000.

Total max. mintage 30,000 on the $10 (1/4 oz).