Sink Stoppers - Primary Function - This tub drain stopper seals and saves water. Effectively seals drains to fill tub with water. Rubber Sink Stopper - Food Grade Silicone - Allows tub stopper to mold itself to uneven or contoured surfaces Low Allergen - This sink stopper is hygienic and dishwasher safe. Easy to clean, guaranteed to last and recyclable Suction cup design - A small suction cup helps it absorb and prevent shifting. Also ideal for larger sinks and kitchen sinks