Product pictured and displayed such that I was able identify the caster for a replacement caster on my chair.

They're casters. Not much to say about them. They do their job

Replaced plastic casters on my office chairs so that I didn't have to put a rig or mat down. The chairs roll so much better and are quieter as a bonus!

Rollers allow the chairs to glide across hardwood floors easily.

These work very well.