Quad Ring, Black BUNA/NBR Nitrile Size: 320, Durometer: 70 Nominal Dimensions: Inner Diameter: 1 1/10(1.1) Inches (2.794Cm), Outer Diameter: 1 13/25(1.52) Inches (3.8608Cm), Cross Section: 17/81(0.21) Inches (5.33mm) Part Number: XP70BUN320