It's been a while since I looked at the info, but I'm almost certain that's what it says. I could be wrong. It should be on the wiki if you want to fact check me.
EDIT: I was wrong, the 2x2x2 block is 10 meters which should make the 1x1x1 5 meters, either way, they are big stroids
Actually, a 2x2x2 block has a volume of 8,000m3, which makes it 20m x 20m x 20m. A 1x1x1 block has a volume of 1,000m3, or 10m x 10m x 10m.
Those asteroids are massive.