Backup Ring Material Hytrel For Use with AS568A Dash No 18 Thickness 0.045 in Nominal Width 1/16 in Nominal Inside Dia 3/4 in Nominal Outside Dia 7/8 in Cross Section Shape Rectangular Durometer 55 Shore D Durometer (Hardness) Rating Very Hard Color Black Temp Range -65 Degrees to 275 Degrees F Package Quantity 50