The Ed Brown Custom 849 refers to the government 9mm stainless steel magazines developed by Ed Brown. These are thoroughly polished both inside and out to prevent any form of drag. Additionally, they are finished with a self-lubricating coating that further ensures each and every round feeds and functions impeccably.Each magazine comes with two base pads - one thick and one thin, along with the associated screws for each. This gives you the ability to decide which pad you\'d prefer to install on your magazine. For a flush fit, you may opt to leave the base pad off. The thin pad can be installed for a low-profile finish, while the thick pad can be utilized if you\'re using a magwell.