Replacement magazine extends the capacity of your Sig Sauer P220 to 10 rounds of .45 ACP, two more than the original magazine. Unlike aftermarket 10-round replacement mags, these are Sig Sauer factory originals properly engineered to fit and function with Swiss/German reliability in your P220 .45 ACP pistol. The Sig Sauer P220 .45 ACP 10-round replacement magazine has a stainless steel body, with natural silver finish, and witness holes on the side numbered 2 through 10.The follower and extended base pad are black molded polymer. Base pad protrudes below the pistol grip when inserted into the magwell.