Nothing funny about feldspar

The NPR Sunday Puzzle:

Next Week’s Challenge

From listener Tom Denk of Ann Arbor, Mich.: Take the two-letter postal abbreviations for three U.S. states. Add the letter A. Then add the two-letter postal abbreviations from three more states. You’ll have 13 letters in all. Reading from left to right, you’ll get a familiar three-word phrase that’s seen on many products. (Hint: The three words in the answer phrase have four, two and seven letters respectively.) What’s the phrase?

HINT: A is the 7th letter, and starts the last word of the product phrase. The second word is the same as one of the states.

MADE IN AMERICA