Radke Plumbing & Heating Pen. Material: metal, plastic. Size: 9/16" diamter x 5 1/4" L. Description: black barrel, gold letters stamped on side: "Radke Plumbing & Heating, Kenneth Radke, 234-5494, Janesville, MN, Air Cond., Wood Stoves, Sewer & Drain Cleaning."