I bought these for Games Workshop figures. They're the correct width but they're super thin. Less than half the height of a Warhammer Sigmar 25mm base.
Stacking them in 2's works okay. I haven't tried these in a tournament yet but I believe the width is much more important than the height so it should be okay.
Just makes my models look slightly off compared to others.
For the price though, you get a lot!