Quoted from Shredso:These are what I'm currently using. While they work great most of the time sometimes they fall off if I go over a part of my floor that isn't level. I've also broken a bunch of them, probably from sitting on floor that isn't level.
How about a link for these?
These?? https://www.amazon.com/Magic-Sliders-08025-20mm-Sliders-As/dp/B000LNPER0/ref=sr_1_14