Do these casters use ball bearings on the swivels and on the wheels?

Hi there, thank you for contacting Office Designs! To our knowledge, there are not any ball bearings in this caster. I hope this helps!

Herman Milller sells two different 2.5 inch casters. Are these the "standard carpet caster" or the "standard hard floor or carpet caster"?

Hello San Francisco Computer Guy - Wendy from Office Designs here - Thank you for your inquiry! This particular set of Herman Miller casters are known as BBs and are Standard Carpet Casters. If you are looking for the Herman Miller Hard Floor Casters, also know as C7s, please try here: http://www.amazon.com/gp/offer-listing/B0027UZ6ZU/ref=dp_olp_new?ie=UTF8&condition=new

Do these fit the soft pad chair?

I'm not familiar with the "soft pad chair". However, caster wheels have a standard that fits most office chairs. I have more than 1 kind of office chair and the same caster wheel fits all of them.

Would it be okay to use these on wood floors? If not, can I get the link for those? Thank you

I bought these casters for use on my wood floors and purchased an inexpensive clear, thin plastic mat directly under my chair area. I roll onto my wood floor occasionally with no problem using these specific casters. It is important to replace all of the five legs of the aeron office chairs so they wear evenly.

Mounting type	Stem Mount
Load capacity	7E+1 Pounds
Caster type	Swivel
Surface recommendation	Multi-Surface
Wheel width	2 Inches
UPC	616639732085
Manufacturer	Herman Miller
Part number	BB
Item Weight	490 g
Item model number	BB
Size	Standard Carpet Caster
Color	Black
Style	Modern
Item Package Quantity	5
Cutting Diameter	2.5 Inches
Batteries Included?	No
Batteries Required?	No
Item diameter	2.5 Inches

Herman Miller2.5-Inch Aeron Office Chair Replacement Caster Set for Standard Carpet (Set of 5)

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