Shop Print Media, No drawers, 92% Polyester / 8% Spandex, Dry Pro™, Submucosal Lifting Agent, 1.14 mm Inner Diameter / 2.4 mm Inner Flange Diameter / 2.4 mm Outer flange Diameter / 2.5 mm Total Length, 6 X 20 mL, For Use with 13 mm Blood Drawing Tubes, Glass Test Tubes, Plastic Culture Tubes