Material: Fluorine Rubber Color: Brown Outer Diameter: 9mm / 0.35" Inner Diameter: 5.2mm / 0.2" Cross-Section Diameter: 1.9mm / 0.07" Package Contents: 10 x Fluorine Rubber O Rings 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).