For some reason, even the most expensive office chairs come with pretty plain plastic wheels. They don’t roll so well, often need a floor protector, and worse they make a bit of noise, especially on harder surfaces.
Most chairs though will take generic wheels stems: 7/16″ (11 mm), stem length: 7/8″ (22 mm).
Generally, the polyurethane wheel material is more abrasion resistant and quieter to use. STEALTHO for example uses elastic polyurethane, which is the safest material for your hardwood floor or carpet (so they say). These are not available locally in South Africa, though, but can be found on the Amazon US store.
I see there are also Slipstick CB690 Floor Protecting Rubber Office Chair Caster Wheels, which are available in SA on Amazon SA (and US). But I’m going to take a chance first on some much cheaper ones I found on Takealot in SA, which are advertised as the Officeway brand.
Yes, some wheels glow in the dark, but that is not a necessity for most people. In my case I’m looking to reduce the noise a bit as my wife records videos with a very high sensitivity level for audio.