Backup Ring Contoured Material Buna N For Use with AS568A Dash No 238 Thickness 0.05 in Radius 0.174 in Axial Thickness 0.04 in Actual Width 0.118 in Actual Inside Dia 3.506 in Cross Section Shape Rectangular Durometer 90 Shore A Durometer (Hardness) Rating Hard Color Black Temp Range -40 Degrees to 250 Degrees F Package Quantity 25