The caster wheels sit in the felt pads but not snug so when you move/roll the chairs they come right off. The caster wheel comes off when the chair is rolled.

Gorilla slipstick glides are the best i've ever used. The design makes sense because the screw not only recesses into the slipstick foot but is covered with an insert that covers the screwhead.

These are pretty pricy. Very disappointing. Kindof disappointing. Such a waste of money. These are junk.