Quad Ring, Black Viton/FKM Size: 005, Durometer: 75 Nominal Dimensions: Inner Diameter: 10/99(0.101) Inches (2.57mm), Outer Diameter: 20/83(0.241) Inches (0.241mm), Cross Section: 4/57(0.07) Inches (1.78mm) Part Number: XP75VIT005