O-Ring No Metal Detectable No X-Ray Detectable System of Measurement Inch Cross Section Shape Round O-Ring Material FEP with Viton Core Durometer (Hardness) Rating Very Hard Nominal Inside Dia 9/16 in Nominal Width 1/16 in Actual Inside Dia 0.551 in Actual Width 0.07 in Dash Number 015 Color Clear with Black Core Durometer 90 Shore A Meets/Exceeds ASTM D2116 Nominal Outside Dia 11/16 in Actual Outside Dia 0.691 in Temp Range -15 Degrees to 400 Degrees F FDA Approved Yes