Material: NBR - Nitrile Seal/O-Ring Type: Standard Primary Sealing Material: Rubber Outside Diameter (in): 4.72 Cross Section Diameter (in): 0.1 Coating: None Notes: Dimensions and Material Descriptions provided for reference only. Color may differ from image. Material Description: NBR is a versatile material with good abrasion and cut resistance. It works well in Air, Engine Oil, Diesel Fuel, Coolant/Urea, Hydraulic Oil and Automatic Transmission Fluid applications. Do not use with Biodiesel.