. O-Ring,PTFE,MSDash 005,PK50 O-Ring, No Metal Detectable, No X-Ray Detectable, System of Measurement Inch, Cross Section Shape Rectangular, O-Ring Material PTFE, Durometer (Hardness) Rating Very Hard, Nominal Inside Dia.Range -100 Degrees to 500 Degrees F, FDA Approved Yes, Package Quantity 50 1/8 in, Actual Inside Dia.