This is my 3rd attempt to pad the bottom of my chairs inside my tiled dining area. The other 2 were failures. I like these pads and the chairs move effortlessly across the tile BUT I still have problems getting the chairs over grout lines.also I think the bottom covers (they cover the screws) are probably prone to coming off, especially moving the chairs over grout lines, though I haven't had that happen yet (1-month).