Woocommerce shipping question

I was wondering would any of you would know how to do this:
-free shipping for only 2 types of brands for above $30 price

I made it so it's free shipping where people need to have at least one of those 2 brands and over $30.
What I need is for ONLY 2 brands when they are over $30, not others products, only for those 2 type of brands. I made a shipping class but can't seem to make it work. The shipping class adds free shipping when there over $30 worth of products and at least one of the…

Woocommerce shipping question