3m Hook-and-Loop Disc Backup Pad,4 in Dia 914

O-Ring, Not Metal Detectable Metal Detectable, Not X-Ray Detectable X-Ray Detectable, System of Measurement Metric, Cross Section Shape Round, O-Ring Material , Durometer (Hardness) Rating Medium Hard, Nominal Inside Dia. 38 mm, Nominal Width 4 mm, Actual Inside Dia. 38 mm, Actual Width 4 mm, Dash Number Not Applicable, Color Black, Durometer 75A, Meets/Exceeds FKM 75, Nominal Outside Dia. 46 mm, Actual Outside Dia. 46 mm, Not , Application Standard