The QB3(NRR23) is ideal for those who require moderate or intermittent hearing protection, as the semi-aural pods fit just to the ear canal opening. With a soft comfortable fit, the QB3HYG, is a great choice with an NRR of 23. The reusable soft foam ear pods are designed for wearer comfort and are washable with soap and water for long term hygienic use. Ratings: NRR 23, SNR 22, SLC80 22.0. Sold in box of 10.