Are earbuds bad for your ears?

Like the ones that kind of suction in your ear. I have them in for very long amounts of time, usually around 12 hours a day on my computer, only taking them out for about 20 minutes of that. Usually watching movies, listening to music and so on. My windows volume is usually set around 50 percent, which I find sufficiently loud. Probably 20% of the 12 hours I have nothing playing, but I hear the static my motherboard lets off for some reason. But the earbuds are still in. Is this safe long-term?