Backup Ring Contoured Material Buna N For Use with AS568A Dash No 439 Thickness 0.117 in Radius 0.344 in Axial Thickness 0.096 in Actual Width 0.236 in Actual Inside Dia 6.524 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 10