This pack of sink stoppers consists of 2 universal sink stoppers and travel plugs from Muzitao. These stoppers work on any kind of a drains including that of bathtubs, sinks, showers and tubs. No suction is required since these sink stoppers lay flat over any drain and tend to stay down. They barely take any space in your bags and hence are ideal for travelling. They are flexible, very sturdy and hence durable enough to last for a long time. Even on being bent, they come back to their original shape and hence prove very convenient to use.