The product is a bag of 100 1/2" PEX crimp rings made by the brand Jones Stephens. These copper rings are certified to NSF/ANSI 372, NSF/ANSI/CAN 61, and NSF/ANSI 14 standards. They are made in the United States, ensuring quality and reliability in hydraulic, pneumatic, pump, and plumbing applications. Whether used for residential or commercial projects, these crimp rings provide secure and efficient connections for your plumbing needs.