How to identify which Wheels are on your chair?
So how can I tell if my caster is a softer rubber/polyurethane or a harder nylon?
An easy way to find out if your office chair uses either soft or hard casters?
Grab a ballpoint pen and try to dent it, of course! Try pushing the tip of a ballpoint pen into the surface of the wheel to your office chair.
If the caster dents, it’s a soft caster, which means it’s probably made of rubber or polyurethane.
If your caster does not dent, then it’s probably a hard caster. Which means it is most likely made of nylon. If the wheel looks like one solid piece, it is another indicator of being made of nylon and hence a hard caster.