The one pictured is more than double the size of the one we had on our K-3 elementary school playground and the smaller they are the faster they spin.
Especially when 5th & 6th graders were around. Not Merry, but they do go round.
On same play ground was a slide with a height that would scare many a man.
The monkey bars were over an asphalt base, sturdy but, if you fell you'd get tore up.
All installed in the '50s the school board finally wised up and removed all 3 of them by the late '70s after 20-30 years of injuries.