This is a 140mm 23-round 9mm Atlas Gunworks 2011 magazine. The Atlas Gunworks 2011 9mm 23-round magazine is a performance-enhanced pistol magazine engineered to deliver consistent operation in target, tactical, and competitive shooting applications. The high-tensile stainless steel spring and self-lubricating polymer follower ensure proper cartridge alignment and reliable operation. The baseplate is available in different color configurations and the removable design allows for quick disassembly when maintenance and cleaning are required.