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.

The sound dampening works better than any other product. They dampen the sound of the closing door better than plastic of felt pads. Reduced noise of closing drawers and cupboard doors.

They're made of polyurethane, not silicone. Silicone is a much more forgiving material for impact and vibration absorption.