You can only use them at Wendy's. Not all locations take them. Only participating ones. The free frosties you get are only 6 ounces. They expire soon and you can only use one coupon per visit. Also, these coupons become invalid of sold, exchanged, or altered. I bought a book for $1 and gave it to a friend. She could not use them because she did not buy them. Not sure how they were able to tell since you don't write a name or anything.