The Bioseal Penrose Drain 1/2 x 36 4325 is a sterile, single-use, latex-free drain that is used to drain fluids from surgical wounds. It is made of soft, flexible PVC and has a rounded tip to help prevent tissue irritation. The drain is 36 inches long and has a diameter of 1/2 inch. It comes with a safety pin to help secure it in place.