Really small, 2" x 6" small.
I'm suffering from orbital sanders thumb. That, after almost holding the work with some honeycomb drawer liner. I would have clamped it in the vise with some scrap to give clearance away from the bench but my bench is in the spare bedroom. I sand out on the deck on top of the patio table.
Would've used double-sided tape but didn't want to deal with the residue. In hindsight, a few wipes with some mineral spirits beats a bandaged digit.
What else is there?