Material: NBR - Nitrile Cross Section Diameter (in): 0.33 Coating: None 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. Notes: Dimensions and Material Descriptions provided for reference only. Color may differ from image. Inside Diameter (in): 7.66