These are 4" in diameter and made as covers for drink containers with straw hole cutouts.  The Flipit is from the Pepsi Comeback Cup issued in 1986.  The orange Mini may also be from a different Pepsi Comeback Cup issued by Dunkin' Donuts. The ones without the straw holes are from the same molds and, viewed in the right light, vestigial remains of the straw hole can be seen on the underside.