At least the adhesive backing is worthless on smooth surfaces.
They bend a little bit too easy, so make sure you take care when nailing them in. It is critical to pre-drill a hole then hammer them straight on firmly.
We replace the cheap plastic pads from our west elm dining chairs with these nail-in felted pads and it was the best decision ever. No more scratched on the floor. Easy to clean with mild household cleaner.
Save yourself a headache and go with a different product. Useless piece of *. Hard to install.
Hammering too much or too hard causes felt to flatten. The nail is not heavy duty and not fastened well to the pad. Seems as though the nail pokes through the foam when there is someone weighing down the chair.
A good product spoilt by it’s small size. About the size of a thumb tack.