I do not want another owner to experience the tragedy I did. So I advise you all to STAY AWAY from the SILENT RUNNER WHEELS offered through The Sugar Glider Superstore online store.
This wheel led to the death of my 7 year old sugar glider. The wheel has ball bearings that do decrease the noise of the wheel when in use. BUT....they seize up after a while which causes the wheel to unscrew itself and fall from the side of the cage. Even if you follow the care instructions to the letter.
This happened to my glider and she broke her foot and injured her tail. That led to a tail amputation and her eventual need to be put to sleep from her injuries.
PLEASE DO NOT BUY THIS WHEEL! If you have one get rid of it! I do not want anyone to go through the pain and loss I have.