Specifications:Material: Fluorine RubberColor: BlackOuter Diameter: 4.5mm / 0.18"Inner Diameter: 1.5mm / 0.06"Cross-Section Diameter: 1.5mm / 0.06" Package Contents:10 x Fluorine Rubber O Rings Descriptions:1.Made of fluorine rubber which has heat, fuel, and chemical resistance.2.Prevent leaks in plumbing, machinery, hydraulic, and pneumatic repairs, etc.3.Can be used across a wide temperature range from -4 degrees F(-20 degrees C) to 482 degrees F(250 degrees C).