Those type wheels are safe but very noisy. I had one like that to start with, I figured it's better then nothing, my boys are small (about 530g and 550g) so the running width wasn't that bad, though it would be if I had bigger chins. Also I have my chins on the other side of the house from where I sleep. Personally I wouldn't buy one again, too noisy and requires oiling and cleaning out the bearings a lot over time, hay, sticks, dust, poop, and/or pee end up gumming it up depending on where you put it in the cage. I'd just save up for a better wheel, flying saucers, silver surfers, and chin spins are a few popular ones.