The Clear Plastic Sink Stopper by Mainstays keeps water from draining out of your sink or tub when doing dishes or bathing. The stopper is made of clear, flexible rubber and pushes into the drain to stop water from escaping. Pull the knob on top to release the water when you're finished. The inner ring measures 3" in diameter, and the entire stopper measures 3.25" with a 1" pull. This home improvement item comes packaged on a hanging blister card.