O-Ring No Metal Detectable No X-Ray Detectable System of Measurement Inch Cross Section Shape Round O-Ring Material PTFE Durometer (Hardness) Rating Very Hard Nominal Inside Dia 4 1/8 in Nominal Width 1/8 in Actual Inside Dia 4.109 in Actual Width 0.139 in Dash Number 243 Color White Durometer 55 Shore D Nominal Outside Dia 4 3/8 in Actual Outside Dia 4.387 in Temp Range -300 Degrees to 500 Degrees F FDA Approved Yes Package Quantity 2