Large Round Paint Sponges - Set of 2
If you're an avid watcher of Debi's videos then you have probably seen the one where she puts paint in the freezer to thicken it up. She uses a number of tools in that video to create a funky layered paint effect, including this set of specialty sponges.
Smaller one: 2 1/4 x 2 1/2"
Large one: 3 1/4 x 3"
See second pic for size comparison to a quarter.
You can watch Debi's video here on YouTube