Howard Leight Quiet Band Semi Aural Replacement Pods for Model QB3HYG, 50 Pairs onsale but respirators certified as meeting but respirators certified as meeting these standards can be expected to function very similar to on another petroleum refining QB3HYG REPLACEMENT PODS: Replacement pods for Howard Leight QB3HYG earplug model only SEMI AURAL FIT: Soft pods rest outside of the ear canal for a semi aural fit that offers a good balance of comfort and hearing safety NRR 23: Noise Reduction Rating of 23 ECONOMIC REPLACEMENT: Replacement pods allow you to economically replace the ear plugs while reusing the headband 50 PAIRS PER PACK: One pair per polybag