They were an original design where the sliders were cupped to pull up the sides of the chair legs only 1/8" to 1/4". They lasted many years and worked great even though I had to glue them on. Each went back into place when the glue failed. No problem. These new ones are flat, not cupped. I've had them in place for about two months now and they're already coming loose and slipping off my feet. As mentioned in other reviews they don't just fall off, the glue/part of the glue sticks to the bottom of the chair leg and the slider part breaks, the slider ends up sticking to the side of the end of the chair leg, the glue is a sticky mess. Looks like they used a commercial double based foam adhesive and it is tearing in the foam part. Too bad they just put glue on the slider and left a layer of foam. Next time I'll buy a nail.
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