Dash Size (in): 353 Color: Black Material: Nitrile (NBR) Cross Section Diameter (in): 0.21 Inside Diameter (in): 4.975 Outside Diameter (in): 5.394 Hardness (Shore A): 75 SAE AS568 Dash Size: -353 Material Description: Nitrile (NBR) rubber is capable of service temperatures of -40 to 100C and is resistant to fuel oils, gasoline, ultra low sulfur diesel fuel and lubricants. Nitrile rubber is not recommended for applications that require resistance to bio-diesel or coolant. Coating: None Color Notes: Actual o-ring color may differ from image. Notes: Dimensions and material descriptions provided for reference only.