After few months of use they are worn out. Did not work at all. All they did was make my floor sticky and made me lose my money.
It is made of sturdy cardboard that is designed for storage and multiple uses.
After pre-drilling, there was no problem. X-protection furniture pads are just the right sized for my project. Chairs slide better and back to quite sliding.
The felt just rips off the mount and your floors are scratched. Terrible adhesive. The glue is cheap and will not stick to the pad.
These gliders are flimsy and small. They easily bend and a few actually snapped in half! Thin gauge nails result in bending when hammered into chair legs.