Flux Products Stoppy Universal Door Stop Assorted Colors (2-Pack) The stoppy is incredibly versatile and will fit into any gap up to 9cm which means it will hold any door or window in your home in position. Made of a durable rubber the stoppy will grip onto any surface - including carpet, ceramic tiles, vinyl and laminate - and it never leaves a mark. It is completely safe around children and pets and can be used indoors and outdoors.