魔鬼黏扣 (H&L) 泡棉掌形砂盤

The foam has just enough give that my 5" discs press flat without digging in at the edges. Sanded a whole dresser by hand and my palm didn't cramp once.

Swapped my old rubber block for this and the difference on curved edges is night and day. The hook and loop holds a 6" disc flat without slipping, and the foam flexes just enough to follow contours without digging in. My hands don't cramp up after an hour of sanding anymore.

The foam backing is firm enough that it doesn't collapse when I press down, which makes sanding cabinet doors way less tiring on my hands. I've been using it with 5" hook and loop discs and they grip tight without slipping.