This package includes 11 masks of the 3M N100 Particulate Respirator model (MPN: 8233 / 54143) with a Cool Flow Exhalation Valve. They are made in the United States and come in a bundle of 11 items. This product is intended for use in healthcare, lab, and dental settings, and is designed to protect against N100 particulates. The brand is 3M, and the 3M ID is 70070709012. This package is a custom bundle, with no modifications made to the original product.