Minnesota Clay's Potter's Wax Penis perfect for fine-line wax resist work. It feature a pressure-activated valve that 'doses' wax onto bisqueware. The unique contour shape is comfortable to hold with a removable tip for easy cleaning and refilling. It draws a 1/16'wide line with medium pressure. The wax is AP Non-Toxic. *Please note: Due to the risk of freezing, Potter's Wax Pens should NOT be shipped during the winter months.