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DescriptionCK Metal Detectable Expand-A-Band Hearing Protector - CK9000 - 10/pk This silicone plug has been tested to be metal detectable down to 1mm. Made from silicone with a detectable additive, the entire plug is detectable, even the enture bands. NRR 24. Suited for food processing, pharmaceuticals and beverage manufacturing. Replacement pods available. NRR 24.