Pro Ears Audiomorphic Ear Plugs Black Large. Audiomorphic plugs are engineered to disrupt harmful sound waves when its loud but allow minimal sound blockage when quiet Specifications for Pro Ears Audiomorphic Ear Plugs: Manufacturer: Pro Ears NRR: 5 - 41 dB Quantity: 2 Fabric/Material: TPE Features of Pro Ears Audiomorphic Ear Plugs 30percent better situational awareness than a standard passive earplug The louder it gets the more sound that is blocked The quieter it gets the more sound that is allowed through Made from medical-grade hypoallergenic TPE for all-day comfort & wear For hygienic reasons this item is non-returnable and non-refundable Package Contents: Pro Ears Audiomorphic Ear Plugs Pro Ears PEAPLB: Audiomorphic Ear Plugs Black Large