I place these on my fridge and they stick on just fine. They won't fall easily but move if you bump them a little And I use them as they were intended: to write on a whiteboards. So far all the colors ink fully and on the first try. Granted I've had them maybe a 4 months and rarely use them. The included erasers on the caps don't effectively take off old ink, so I use alcohol pads. Not a big deal but defenitely something to note. Four stars because the some colors, like yellow and baby blue, come out pale and hard to see.