Just wanted people to be aware of the dangers of these types of wheels:
I usually get the solid plastic wheels, but after having multiple tubs chew them off the stand, I decided to give the metal wheels a go. Well, one of my asf got knocked off the wheel while another was running, and got caught between the stand and the spokes that attach the wheel. Poor little guy was beat up pretty bad, had to euthanize him.
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Needless to say, I switched back to my old wheels.