These are awesome!!!!!!! After scratching up my wood floors by using subpar stick on pads (that would just collect dog and cat hair and ultimate fall off).. These are very secure. Now.. If they wear out, how will it come out and will a new one go in without slipping out of the existing hole. I don't know.  But I do know that they allow the furniture, dining room chairs and table to slide without complaint and WITHOUT SCRATCHING YAY!! :)