Items weighing over 1lb, will the program NOT allow them to choose 1st class mail shipping rates?

Customer:

I can use your plugin just for “real time” rates in the cart ONLY. – I use the shipping easy with UPS – Fed Ex DHL as well.

If someone is purchasing an item which weighs over 1lb, will the program NOT allow them to choose 1st class mail shipping rates?

Support:

Items only weighing up to 13oz can be shipped via First-class mail.

Since 1lb = 16oz, so items weighing 1lb or more than that are not eligible for first class shipping.