It's utter amazeballs
Used to keep fabric taut. Allows for even tension and helps project lay flat. Can be used as a frame for a finished piece. Helps to hold fabric.
Better for smaller projects - can flatten stitches and leave hoops marks - will wash out though. Bigger full coverage use q-snap frame
Lots of avariously of shapes nd sizes on the market
Comparision review of a few different
Michael’s Expanding their Anchor stock - just started selling these rubber ones